The city candidate, or his or her campaign committee, or a primarily formed committee pursuant to section 101C(B), in receipt of any excessive or prohibited contribution shall, within 72 hours of receipt thereof, return any such excessive or prohibited contribution to the donor. In the event an excessive or prohibited contribution is received and reported in the campaign statement, the recipient shall, within 72 hours of notification by the City Clerk or within 72 hours of notice of complaint from the Fair Political Practices Commission, return such excessive contribution to the donor.