Teljoy internal system non existent as they cant keep to their own arrangement

I am so frustrated with Teljoy. It seems that the trouble just never ends. Last month I had a query due to a double deduction from Teljoy when I was never informed of this. They also did not capture my updated correct information but requested me to contact them and waste my time due to their incompetence. The Teljoy agent assisting me then agreed that the arrears (the extra month rental I was unaware about) will be deducted over 3month with a total of R 450 payable per month. When I received an sms that the arrears of R 295 will be deducted from my account I AGAIN had to phone Teljoy account queries where the agent said that the R 295 and the monthly rental will be deducted. I explained to her numerous times that I have an arrangement to pay of this amount and after a few times of explaining she found a note on the system that the amount will be paid off and R 450 will be deducted from my account. And then after all this trouble Teljoy went and deducted both the R 295 AND the R 331 and did NOT keep to the arrangement. It seems that I have to go through the whole process EVERY month and then it is not done. I am so tired of wasting my time with Teljoy and their internal processes not working. They cannot even keep to their own agreement. I cannot wait for the 6months to be over to just cancel this contract as it is just not worth all the frustration. I will write back the R 295 deduction which I did NOT agree to.