I had some work done on a car. Items were stolen and the work was not completed. Also, they will not give me a receipt.
Theft is a matter for the police. The civil law equivalent is the tort of conversion.
If the work was incomplete, this may give you a right to claim for breach of contract.
As regards a documentation, they will have a legal obligation to provide a VAT invoice in the proper form if both you and they are registered for VAT. There is however no general obligation to provide receipts in English law.