HAD SERVICE AND UNANSWERED QUESTIONS

I have never been this disrespected by a service that I am paying for. They keep on sending me messages and emails that I owe them yet I have been paying every single month, when I call them I get the call disconnected and some agents don't know what the problem is cause I have sent them my bank statement from the time I have taken their service till present. No one can explain to me how I owe them R473. 00, I wouldn't recommend this service to anyone, their accounts department is appalling and I want answers as to how I owe them and this whole situation is ****ing me off!!