Every contract for physical fitness services at a planned physical fitness center or a center under construction shall further provide that, in the event that the facilities and services contracted for are not available within 12 months from the date the contract is entered into, or within 3 months of a date specified in the contract, whichever is earlier, the contract may be cancelled at the option of the customer, and all payments refunded within 30 days of receipt by the center of the cancellation notice.