bad service, Im soo disgusted.

Im soo ****ed ryt nw, I called the call centre today to ask about my bill and the advisor was soo rude and hung up on me without even assisting me. My bill was R688.00 instead of R350 and wanted to know why instead of helping me I was told that supervisors are on strike and there is no one to assist with my query. I've always had bad service from you guys but today was even worse. The advisor placed me on hold without notifiying me and then decided to hang up there after. I want to cancel this contract asap Ive had it with mtn. This is the worst customer service in the world.