Disappointed and furthub with nimble collection

So my finchoice account was handed over to nimble group collection,nimble put a debt collection at bureau under my name,few months later finchoice cancelled the contract they had with nimble and took my account to another collection but nimble never removed the collection on experian as they were nolonger handling my account.now I paid my account in full got a paid up letter and account was updated but the collection under nimble is still there,I tried numerous times to call nimble but I get no help,my life is stuck as I can't do any applications because of the nimble collection.should I involve my lawyer as this company doesn't remove the collection?