MBD Debt Collectors review: Settlement letter

I am expressing this with great disappointment. I was harassed everyday for an unpaid identify acc debt now that I have settles the debt and have requested a settlement letter I am being sent from pillar to post. All I neeed is settlement letter. I spoke to countless agents but nothing. I was even asked to call customer service but still my query has not been attended to. My ref no [protected]. I need this to be delt with.