I have been living in my current flat for approximately 5 years. Firstly with a partner and recently by myself. During this whole time I have had a pre payment meter taking debt every time I top up for a previous tenant. Through my own laziness and stupidity I didn't pursue the issue. I tried to at first but couldn't figure out where to start and about a year or so ago the 'debt' being taken off was a negligible amount (approximately 50p-£1 for every £10 I topped up). However, recently the rate that the debt is added seemed to have escalated to £2-£3 per £10 topped up. I should have pursued this much sooner I realise this, but I would really like them to stop charging me for a debt that has never been mine and to recover some or all of the money that I have paid towards this debt that is not and never has been mine. Is anyone able to advise who I should contact and how I should go about this?