No service provided but quick to bill

I called MTN to request itemised billing for Jun to Aug 2018. I have had to follow up 3 times already and each time am told they e-mailed it. Thus far I have not received it but I got billed for Jan itemised billing. The only reason the itemised billing was added it's because I needed those statements which I have note received but already billed. This is really poor service, I just cancelled my other contract with the other provider maybe I should reconsider and rather cancel MTN. I can't be asking for stuff and it's not provided to me but already they taking my money for service not even provided. I was happy to pay for those 3 statements but I never said I wanted itemised billing going forward, you'd better cancel and refund my Jan fee if you are not going to send me statements I requested.