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I am sorry to hear about your situation.
From the circumstances given it appears your rights under the consumers rights act 2015 has been breached. This is because it states services provided must be performed with reasonable care and skill. In view of the works undertaken it appears the service given did not meet the standards expected given the agreement was to fix the van for the price quoted.
The remedies available to you is price reduction which can be up to 100% of the amount paid, repairs until the issue is fixed and you can consider hiring someone else to do the job and then claim the money back from the people that did the defective works.
In view of this I suggest you write to the repairer and remind them of your rights under the Consumers Rights Act 2015. Inform them to release the vehicle so you can obtain an independent quote to fix the vehicle and assess the works they have done. Assuming the independent repairer states that the works already undertaken was below standard then you have a potential claim against the initial repairer for the works they have done and money paid to them. If they continue to refuse access to the vehicle then i suggest you consider reporting them to trading standards as they can step in to assist you with this issue.
I hope i have clarified the position, if not please let me know.
Thanks and stay safe.
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