The BT SAR should show your contact yes, but does depend what notes were made as to how helpful it is... phone recordings aren't kept for very long.
Talk Talks SAR might be useful - if they said they would cancel with BT it should show in the info and presumably they have had to have your account ref etc with BT to do so - and should be records of any contact they made with BT re your account. It will also confirm dates.
Talk Talks SAR might be useful - if they said they would cancel with BT it should show in the info and presumably they have had to have your account ref etc with BT to do so - and should be records of any contact they made with BT re your account. It will also confirm dates.
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