Internal politics for customers account -VODACOM

I am so ****ed off with Vodacom they delete the ***** line and sort out everything under the ***** account beside refunding me my money. They say I never pay my April 2018 bill , looking at my banking statement I have e-mail to them it have been paid. Plus as a customer my account have been over paid. It's wrong guys to do what you are doing! I have called the accounts department 4 times yesterday I have been cut off , they made me hold then they put the fone down on me. You guys need professional people to work in your business. I expect this account review to be finalized in 7 working days. I need to know do you value your customers? ?