This happened to me all be it about 15 years ago when I had my identity stolen. I was advised to register with CIFAS and Equifax and dispute the fraudulent activity on my credit history. It took a while but eventually all the history was cleared.Bought a house in April. While we had saved for a while and had a great deposit, mortgage is high because of my credit - someone had taken out phone contracts in my name and ran up bills. Tried to contest it but got nowhere.
It’s been hard the first few months. I’d say about 65% of my wage goes onto our bills before we get to the spending money on other things