Failed to resolve bonus wagering issue in a fair and honest way

Hi, Please do not mention any email, name, address information in this complaint section due to privacy. In august I made a deposit and received a bonus of 150. While playing, I managed to have a balance near 1650 euros, which then I went ahead to check my wagering and I noticed my bonus title had said it was in its lost stage. I still had my balance at the casino, and this error did not make any sense at all. I asked via chat and explained the issue. I also mentioned to them my balance was slowly dropping without me making any bets. After numerous chats and emails sent to them, they implied I made deffered bets (meaning I had saved multiples spins on a slot game), which was not the case. They removed my whole balance of near 1650 euros claiming I was abusing their system, which was also not the case. After weeks of arguing and mentioning this issue on various complaint sites ,they finally credited me back a certain amount in my casino and with specific terms. Which was a month later. Instead of my bonus of 150, they put a bonus of 500, with zero percent wagered. (At the time I had 4 % wagering completed). I have valid screenshots of this too. My balance was also near 1650 euros, and they only credited me back 1400. They also put a maximum withdrawal of 1500 for this bonus. When I had read their terms, there were no maximum winnings term applicable at that time in august. I messaged the casino privately quite a few times to bring this issue to the manager or owner, and no one has yet responded. I was kept being told to wait for the managers email as chat members did not have access to this information. It has been over 2 weeks now. They knew something was wrong with their system so this is why they credited me back 1400 euros. I would like the casino to fix my balance to 1650, and let me finish my wagering requirements, and remove the term of maximum withdrawal of 1500 as there was no such term when I had made the deposit. Thank you