Gaurantee Payment not met

Lucre Ultimate solutions is the holder of my guarantee for a Forex trading training provider. The guarantee stated that if I was not to make a 40% ROI after 6 months, my full investment will be paid back to me. I did not make the 40% ROI as mentioned above and claimed my guarantee from LUS. They offered me an extension to the guarantee of 6 months, wherein they agreed to fund my trading account with $150.00, however they did not meet their end of the bargain, and I once again claimed my guarantee. After numerous calls, emails and private messages, they finally agreed to honor the agreement and pay me back the guarantee, but asked to do so in installments due to the difficult financial times experienced in 2020. I had the owner of LUS sign an "Installment Payment Agreement", and they paid the first installment on time. From there things went south, They started ignoring my calls, emails etc., and I gave them ample time to rectify the issue. However, they did not respond, and I was forced to appoint a debt collector agency to try and get them to pay. They did not, and I further had to resort to blacklisting the company through the appointed debt collector, therefore they should not/cannot provide financial services to anyone until he has settled his default payment(s). If they would've met their part of the guarantee, the unpleasantness would not have occurred.