My phone is locked once more but my rental agreement with Foneyam finished in July

I come here with a broken heart, after a struggled for almost 3 months because after I paid off my rental agreement with Foneyam in July , my phone was locked for about 3 months because I was been send from pillar to post by foneyam. I paid off their phone bt I am unable to use their device anymore. My phone only worked for a month after I struggled to have the matter of my phone bn locked been resolved. How does it happen that my rental agreement expired in July den in September DTZ is when I was able to unlock my phone but guess what as I type this message now my phone is locked again. Is there anywhere were we can report foneyam because of their bad service to its clients