Nimble Group and Michael

I paid Wonga account back in 2021 and i sent proof they confirmed payment , they listed me to The bereau after i have made payment , when i contact The bureau to query this account they requested for paid up letter , contacted Nimble Spoke to Michael and The case dragged sometimes i would have to ask for update , and it ended up with no paid up letter they are refusing to give me a paid up letter , they say payment was not made , sent all proof that they requested Any legal person who can assist me with this case can you please come forward