Im sick and tired of your pathetic service

Im writing this mail with utter desperation,My account is up to date but however my cellphone has been hard locked for no apparent reason.My business has been incovenienced as I cannot reach my client and vice versa.<br> I need a written apology from the Ceo and senior management re- assauring that this problem wont happen again in the future.I have had this contract for almost 3 years and not even once have I skipped a payment.I would also like you to cancel my contract with immediate effect because of the poor service