Cancellation of a contract and moving to prepaid

Dear MTN, stop wasting my time by transferring a call to the retentions department when I am requesting a cancellation of my contract with you. You do not have a retentions department you are wasting valuable time. If you do have, please start a new team and replace the Team Leader in that department as they have failed. I do not have time to hold for 30 minutes and no response. Please cancel my contract as from the date of this reference call number ********** 46. I did advise you, please act promptly