Billing me after I asked the line to be swiched of

I currently have two contracts with mtn. One I use and one I don't, I have asked mtn to stop the other line. I have called the 808 number over 50 times. No answer. And when somenone answers they don't do a thing they say they will. I want all my lines canceld with mtn, and this was my request to a consultant 40days back. Yet both lines are working and I'm expecting the bill like the one I payd 30 days back. Ref. Num, to my last call is ***. My one line is due for update 6months back. Mtn is so useless they never even informend me, they must be doing realy good if they don't even market new contracts to customers that already pay.