Poor service

Hi I have app**** for a telkom lte contract over 6 or 7 months ago and have not received any service from them to date.they have dedicated money from my account numerous times and I had to go reverse the money continuously at the bank.Every month I get a bill from them asking me for money.i have phoned them and spend over R500 worth on airtime.ive contacted there service centre and account department but nobody can help me.they have now handled me over to a collection agency which also asked me for money. I refuse to pay for something I have never received. No installation was done at my property. They even once explained to me how much data I used and what is left on my account, can you believe that.they say my account is cancelled but yet they still want money.im fed up and dont know what to do.please help.my name is in the balance