E. A developer shall promptly amend the public offering statement to report any material change in the information required by this Section. In the event amendments are made to a public offering statement provided to a purchaser whose transaction has not closed that materially alter or modify the offering in a material and adverse manner to a purchaser, the amendment shall be provided to the purchaser together with a notice containing a statement in conspicuous type in substantially the following form: "The public offering statement previously delivered to you, together with the enclosed revisions, has been approved by the Louisiana Real Estate Commission. Accordingly, your cancellation right expires seven calendar days after you sign your purchase contract or seven calendar days after you receive these revisions, whichever is later."