I got my Tucson with a £4500 deposit contribution for taking out a loan with Hyundai Finance.

Hyundai Finance sent a copy of the agreement and it says I can withdraw from it within 14 days.

If I do, will they ask for the £4500 deposit contribution back?

Thanks,

Judging by this report they are certainly not handling the situation well..I would recommend you print off what you find on line and stuff it under the nose of your dealer to drive the point home..

https://www.usnews.com/news/top-news/articles/2021-03-24/kona-ev-owners-say-hyundai-mishandling-recall-for-battery-fires

I echo the views above re building a relationship with a dealer. I bought an i40 from a main dealer, who I wouldn`t deal with again. The car was ex lease (arval) and had its first service at Halfords. The supplying dealer (with multiple Hyundai Franchises) had serviced it but out of sequence and between services and tried to pass it off  as OK.
  The dealer I started using explained that Hyundai allow the servicing to be brought back into line in circumstances like this by using franchised dealers. If you don`t then to all intents and purposes its null and void. I also find, if you have a relationship , they are open to haggling on service prices as they want to keep your business. I`ve always used dealer servicing for different makes I`ve had and its always worked for me.

Then just a snippet for you so you know what its all about WAFU..

If Kia doesn't pay, the hackers will release the stolen data to the public.
UPDATE 3: Hyundai also responded to our request for comment. Like Kia, it is denying the allegations of a ransomware attack:

Hyundai Motor America is experiencing an IT outage affecting a limited number of customer-facing systems. Those systems are in the process of coming back online. We would like to thank our customers for their continued patience. At this time, we can also confirm that we have no evidence of Hyundai Motor America or its data being subject to a ransomware attack.

 

UPDATE 2: Kia responded with a statement regarding this issue:

Kia Motors America Statement Regarding IT Systems Outage – 2/18/21

Kia Motors America, Inc. (“Kia”) has been experiencing an extended systems outage since Saturday but can confirm that the UVO app and owner’s portal are now operational. We anticipate remaining primary customer-facing affected systems will continue to come back online within the next 24-48 hours, with our most critical systems first in line. We apologize for the inconvenience to affected customers, especially those impacted by winter storms, who felt the outage of our remote start and heating feature most acutely. Kia is wholly focused on fully resolving this issue and would like to thank our customers for their continued patience.

We are aware of online speculation that Kia is subject to a ransomware attack. At this time, and based on the best and most current information, we can confirm that we have no evidence that Kia or any Kia data is subject to a ransomware attack.

 

UPDATE: An anonymous tip to Motor1.com alleges that Hyundai dealership technicians are unable to access part of the system for using diagnostic equipment. This has allegedly been the case since Saturday, according to the person who contacted us.

We've contacted Hyundai and Kia with these new details for confirmation.

 

A group of hackers attacked Kia Motors America and subjected the automaker to ransomware that has allegedly shut down vital services like its UVO Link apps, payment system, and the sites that dealers use, according to Bleeping Computer. The hackers are requesting 404.5833 bitcoin to decrypt the data, and at current values, this is equivalent to $20,899,559.53. If Kia doesn't pay quickly enough, then the ransom increases to 600 bitcoin ($30,994,200).

Bleeping Computer also obtained the alleged ransom note that the hackers sent to Kia. The letter says that if Kia doesn't make any attempt to contact the attackers within three days that a portion of the obtained data would be made public. The demands doesn't specifically say what type of data that this hack stole.