Debiting my account incorrectly!

Firstly its impossible to get service or someone answer your call. On Saturday i received a message stating i am in arrears when you did not attempt to even debit me???? I tried to call wasted my airtime to the value of R110.00<br> trying to contact the call center no one answers the voice prompts state you can leave a message press 1 you do that and get cut off??? Yesterday an amount of R3000.00 goes off my account?? This is not the agreed amount. if you took my call an arrangement would be made. You go into my account whenever you feel fit??? take any amount you wish??? That is *******! I want someone to call me and my money back!!! Called today again and spoke to Thandi who cant help but transfers my call to someone named Ruby who is supposed to help but during the transfer the call cuts?? This is pathetic service. I WANT THIS RECTIFIED.