Poor service from Account Services

I have been sent from pillar to post since I downgraded my account in May. Each consultant who calls me gives me a different version of the story. I know for a fact that there should be credit on my account app**** back and I was promised yesterday that it would be done and today all will be fine. Guess what the latest statement that was sent last night still reflects an overdue amount that was a billing mistake from Vox. I am tired of sending chats on Facebook and WhatsApp. I have exhausted my airtime and time trying to resolve this issue. My account will be debited more money again in the next 2 days. Can someone who cares about customer service call me to resolve this. The service received thus far regarding this matter is ridiculous.