Hello im new here so ill try to do my best but im looking for help with a debt i just recieved. in 2018 I moved to a property lets call it A and signed up for British gas dual tariff for both gas and electricity. March 2020 I contacted British gas to tell them i no longer needed their supply as i was moving out, i was told to give an address I was moving to (My parents) which i did and that was that. March 2020 move back in with parents. December 2020 I move to a new property. March 2021 i receive a debt letter from a collection company for two separate accounts one Gas and one electricity both adding up to around £1300. Contact collector who said the would contact british gas. British gas have now contacted me. British gas have said i never told them i was moving and need to provide an end of tenancy agreement and 2 other letters confirming i moved. British Gas want me to pay March 2020 to March 2021 for property i left. I have letters from Virgin media to say account ended April 2020 but they wont accept this. I never received anything from landlord to say i moved out but told them i would ask for a letter from landlord to confirm they said this will not be accepted. I am unsure what my next move with them should be as i have no proof of a new tenancy as a moved in with parents (whom would happily write a letter again told not accepted) i have post dated april to dec from parents address including driving license with address on but again they wont accept any of this. The only tenancy i have is a new one i took out in DEC for the property i now live in but this only covers me DEC - MARCH. Any help or advise would be greatly appreciated.