Wow clearly no idea what the are doing i have paid my account and proven that it is done leve me alone please

I paid a account off with you lot 3 years ago and sent the proof of payment to your dept collectors now they whant me do send a certified coppy of my id and and the settlement letter againg after I have sent the paid up letter i do not wish to do business with Cellc can your company please stop harassing me for a account that has been dealt with 3 years ago i am really considering to go see a lawyer enough is enough