What is the use of end contract date if is this useless

When u on cellc contract wat is the use for you to say the contract end on this day but u keep deducting the same amount from my account as if ur phone doesnt depreciat. And whn we go to ur shops to take contract they help with no hassles but when you want to cancel they tell you to call how boring is that.i went to mokopane branch last year december to cancel my contract they say i must come on march ka march whn i got there ur branch was closed.