A seller must furnish every buyer with a fully completed receipt or copy of any door-to-door sale contract at the time a sale is executed. Such writing shall be in the same language as that primarily used in the oral sales presentation, show the date of the transaction and contain the name and address of the seller, and in immediate proximity to the space reserved in the contract for the signature of the buyer or on the front page of the receipt if a contract is not used and in bold type, a statement in substantially the following form: