Upon request, any registrant or his employee shall give to a requesting consumer an estimated completion date for repairs or maintenance, in writing, or disclose in writing that a completion date is undeterminable. An automotive repair facility shall not incur any liability for breach of the written estimated completion date for a repair if such delay is caused by an act of God, strike, unexpected illness or unexpected shortage of labor or parts. (1975 L.M.C., ch. 21, § 1; 1980 L.M.C., ch. 10, § 1; 1980 L.M.C., ch. 34, § 1; 1983 L.M.C., ch. 42, § 4.)