UTILITY WAREHOUSE - BILLING RECONCILIATION STILL REQUIRED

I have just moved my electricity supplier from Utility Warehouse to e on. The transfer progressed smoothly - but I have spent months asking Utility Warehouse to send me a reconciliation of my account and my prepayment meter - as they seem to have had me funding both when that should CLEARLY have NOT been the case. So I want a reconciliation - and if I have over-paid, which I suspect I have - a REFUND. But nobody is interested in progressing my query. I have just had yet another LAME RESPONSE saying that as I had recently contacted them by phone, they will assume my query is resolved! DO THESE PEOPLE KNOW WHAT THEY ARE DOING? RECONCILIATION BY PHONE? REALLY? It such a shame because there are some very helpful people at UW who have helped me. But, in general, e-mail response times are APPALLING and only when you find the right person do you get anywhere. AND THERE ARE TOO MANY 'NOT-RIGHT' PEOPLE WORKING (ALLEGEDLY) IN THIS BUSINESS.