BILLING IS A MESS just like the staff

We upgraded 3 data contracts and 1 cellphone contract in March, and when we received the first bills, everything was wrong, I did call the accounts and spen over a hour on the phone to try and explain and rectify the account, 1 month later the bills are still a mess. On the one data contract they charge us for a device, which was free when you signed the 24month contract, but they are charging R100.00 a month, I did get the lady to read the details of the contract where it stated that the device is included, but still they cant get it right. They Charge CLI on all 3 data contracts, which I told them we don't need as we are using modems. They are charging for 10gb on the on contract but only load 5Gb. Again today I am on the phone with then and after holding for 45min, I did speak to someone, who almost immediately put me on hold again, I am sure the lady Akona, went on lunch while she placed me on hold. Come on Telkom I need this sorted out as you are now almost *****ing R300 a month from us, and there is nobody that can sort this out, all the staff appears to be ***********.