Worst service ever

My account was handed to them and the amount changed from R13000 + to R17000+ and on asking that at least I receive a statement every month so that we are both on the same level from now they ignored me. As off now according to my records R8000 is outstanding but i will not be surprised if the amount changes again to R20000 +. It took them three weeks to email me a statement in the past and after requesting one and that is when I received the one i believed was cooked. Receiving a statement cannot be that difficult and it will ensure that if I have questions I ask them there and then and if I am wrong they will clarify immediately also