Md. Code, Commercial Law § 14–2203

(a) A contract made pursuant to a telephone solicitation is not valid and enforceable against a consumer unless made in compliance with this subtitle.

(b) A contract made pursuant to a telephone solicitation:

(1) Shall be reduced to writing and signed by the consumer;

(2) Shall comply with all other applicable laws and regulations;

(3) Shall match the description of goods or services as that principally used in the telephone solicitation;

(4) Shall contain the name, address, and telephone number of the seller, the total price of the contract, and a detailed description of the goods or services being sold;

(5) Shall contain, in at least 12 point type, immediately preceding the signature, the following statement:

“You are not obligated to pay any money unless you sign this contract and return it to the seller.”; and

(6) May not exclude from its terms any oral or written representations made by the merchant to the consumer in connection with the transaction.