Never will i buy from fonechoice again

Ive settled my accounts in full the end of january, im getting calls from a debt collection agency for the accounts. Ive requested multiple times for this issue to be sorted out.ive sent through paid in full letters to their legal department and still im battling for this to be updated. Each time i call the agent just says ive put through a request and await their feedback. This is the most pathetic service i cannot contact anyone else besides their call centre to resolve this issue and nothing is being done. WHEN WILL THIS MATTER GET RESOLVED!!!!!!WHAT ARE YOU DOING THERE!!!!