Prescribed Debt

Dcm says i have agreed on a debt which has long Prescribed Debt back in 2016 which i have openned the account in 2010. so i have been asking them for phone records for the past 5/6 months and they are failing to came with proof of phone records which they said i aggreed to them. this people are just buying Prescribed Debt and want to make us pay for it which i wont