Poor Service

Good day

I am currently struggling to get a query resolved with The Meter Man, basically I am being ignored on WhatsApp and no feedback on email correspondence. I was advised by the sales person whom I have been dealing with since day one on how to proceed to make payment towards my installment for their meters. Instead of my payment going towards my installment it was used as electricity. I have also escalated the query to the accounts department and I've hit a brick wall. The salesman is point blank ignoring me. I would like to know who is taking responsibility for the wrong information that was given to me and how I will be refunded.