bad bad bad service

I am very frustrated once again with the way telkom has handle my complain my contract expired on the 18 dec 2015 on the 17 dec 2015 I send a cancellation form to the cancellation department 25 January 2016 and nothing has been captured yet for January they deduct more that the usual installment nobody inform me that I must pay a new installment according to me the contract was suppose to be cancelled already because I did my part and send in time the necessary documents to your department I am highly upset is not the first time that I have bad service with your department please if possible sort it out