Section 405. Delivery of copy of contract or obligation; buyer's acknowledgment

The seller shall deliver to the buyer, or mail  to  him
  at  his  address  shown  on the contract or obligation, an executed copy
  thereof.  Until the seller does so, a buyer who  has  not  received  the
  goods  or  services  shall  have  an  unconditional  right to cancel the
  contract or obligation and to receive immediate refund of  all  payments
  made  and  redelivery of all goods traded-in to the seller on account of
  or in contemplation of the contract or obligation. Any acknowledgment by
  the buyer of delivery of a copy of the contract or obligation  shall  be
  printed  or written in a size equal to at least ten point bold type and,
  if contained in the contract or obligation, shall also  appear  directly
  above  the space reserved for the buyer's signature. The buyer's written
  acknowledgment, conforming to  the  requirements  of  this  section,  of
  delivery  of  a  copy  of  a contract or obligation shall be presumptive
  evidence of such delivery  and  of  compliance  with  this  section  and
  subdivision four of section four hundred two in any action or proceeding
  by  or  against  an  assignee  of  the  contract  or  obligation without
  knowledge to the contrary when he purchases the contract or obligation.