bad bad services

This company provides poor services, all the agents I have dealt with are rude and none of them could help me. I made a full payment to my account on the 3rd of May 2021, I was advised that the payment will reflect in 7 days and they will send me a paid up letter. I have been calling them for a week and all the agents are telling me different stories about my account, I sent them the proof of payment and they advised that they received my proof of payment and they will send me an email with my paid letter. I waited for the whole week till I make a call today, I was advised that my payment is not reflecting. I explained to the agent that I sent proof of payment and all I want is the paid up letter, she couldn't help me. I requested to be transferred to the manager who can assist, she said she can't transfer me