Yes you can cancel it at any time. The contract itself should have terms addressing the cancellation procedure and costs, if any. You should receive a pro-rated refund of the amount you paid, unless the car is financed.
If the car is financed, they will typically appy the refund to the balance - otherwise they would be financing a cash advance to you. You must have a copy of the service contract in your paperwork. If not, you need to request one from the dealer.
He has to keep a copy on file. If he cannot produce your signed copy, then you have another "out" - but that one requires more effort and possibly professional intervention. Barring that, ask for a blank copy of the same agreement.
He has to keep those on hand, since he sells them to his customers. Read that agreement for the terms and conditions in cencelling.
Well it depends if you signed something that said the service contract could not be void once signed. You should have a copy of your contract. Read it.
It might give you a 2-3 day window that the contract can be canceled. Always read everything on a contract thats going to cost you money. It may save you alot of money one day.
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