Unbelievable!!!

I tried to cancel my contract in November, Cancellations department convinced me to stay on a sim only deal for 500mins a month and 5 gig day/5gig night. The mins was only loaded after 10 frustrating calls. Now mid December my minutes is gone, I cant make any calls, I have to wait 24 hours for itemized billing. I have since made 5 calls again to resolve the issue, no one can help. Getting pushed from department to department / person to person... lines getting cut. Worst is every time I call the language is, I guess Zulu so I have to sit around and press random numbers hoping to arrive at a consultant. Absolutely shocking service, how is this allowed or even possible to happen