bad service from Cell c

Hi <br> On the 3rd of December 2015 i did an early upgrade with cell c and the consultant who was helping me said im gonna pay R119 every month to my suprise on the 4th of April i discovered that my payament is R179 not the R119 we agreed on, then i called Cell c and enquired and i was told that they will call me within 3 days and they never called me , then on the 11th i called them again and the consiltant said they are still waiting for the recordings i will get a reply tuesday the 12th and up until today there is no contact from cell c and i called them again today and i was told im gonna get a call tomorrow, my concern is that month end they gonna deduct the R179 which i did not agrre on, Cell c can you please treat us with respect cause are your loyal customer and the way you are trwating me is not fair can you attend to my query by today and resolve it or else im escalating my complain further