Notice by a supplier of any amendment, modification, termination, cancellation, discontinuance or refusal to renew an agreement with the wholesaler shall be written, shall be made by certified mail, and shall contain all of the following:
(1) A statement of intention to amend, modify, terminate, cancel, discontinue or refuse to renew the agreement;
(2) A statement of the reason(s) for the amendment, modification, termination, cancellation, discontinuance or nonrenewal; and
(3) The date on which the amendment, modification, termination, cancellation, discontinuance or nonrenewal will take effect.