I set up a contract for 1yr for my daughter's flat, using Eon as the previous owner had used them. Meter readings had been supplied by them and us, for both standard electricity and Eco7 supplies. One bill was received a month later, in June, and seemed ok. Then there was nothing for almost a year until the deal expired. An estimated bill arrived, so I phoned through the correct meter readings as theirs were wrong. The girl taking the readings said that I had them wrong, but I knew that I hadn't. She put the account "on hold" whilst an issue was resolved. After 5 days of monitoring the readings, I worked out was wrong myself. They had the meter readings the wrong way round!! I myself told them what the issue was. It took TWO MONTHS and 6-7 calls to an 0844 number to get a final correct bill with an outstanding amount of around £600! I believe that if we hadn't moved to Scottishpower (and they provided meter readings to Eon) we would have still be waiting now. Whilst their call centre staff were fine (once you managed to get through - lengthy waits) they kept saying that they were sorting it and would get back to me, They never did! Wouldn't touch them again.
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