Dear Experts,

I was a Powergen (now e-ON) customer from Jan '06 to July '06 (7 months).
In Jan '06 I provided Powergen with Actual Gas Meter Reading. Then I paid my first quarterly gas bill of approx. £120 in April '06. At the end of July '06, I vacated the rented property. Hence, on the final day I called Powergen with Actual Gas Meter Reading and they asked me to pay approx. £100 which I paid on the same day. After this, I returned to my home country.

Recently, at my new address after around 3 years, I have received a letter from a Debt Collecting Agency. They told me to pay some £180 towards old e-ON gas Bill else threatened to take legal action. When I contacted e-ON, they told me that when I provided the final meter reading at the end of July, they asked me to pay £100 which was an estimated bill. According to their actual calculations, I owe them extra £180 for gas usage from Jan '06 to Jul '06.

I was an electricity customer of Powergen during the same time as well. And when I enquired about it, they said that estimated bill that I paid was £1.56 more than the actual reading so that is ok.

What I would appreciate from you experts is below info -
1. For meter bill of 7 months, how can the deviation between estimated and actual gas bill come to a big amount like £180? If so, then can nobody question them about their estimation procedures?
2. Can they contact me after around 3 years and force me to pay this extra £180?
3. They conveniently forgot my electricity account because I had paid them more than actual reading. Can they be such un-professional?
4. e-ON is threatening to put my name in black list and scare me with their debt collecting agency? How fair is it?

Can nobody help me? What should I do?

Regards,
AP