Disgusted with service I received from cell c

I'm so disappointed with cell c service , I took 3 data contracst 2 years in River Square . Three rivers, all 3 I was informed that I will be paying an amount of R896 the deductions have been going through every month without a family, suddenly my statement for this month the amount due is R1429,19 and the explanation that I received is that they did not load my discount for this month and I was told to wait for 2 working days for a response. I find this very *********** from cell c, non of the information about the discount is was never explained to me when I took the contract. And it is disturbing my lifestyle because I do not have night data and they reduced the data as per initial agreement . I am not happy that I'm told that if the debit go through cell c will owe me , what about my oder debit order that suppose to go through do they want them to lapse. The level of competency is so bad and I rate this the worst service I ever received from cell c. I have been a loyal customer for the past 18 years to this company. I do not deserve this I'm so disappointed