Maximizer Software Inc

I've been using Maximizer since approx. 1992. I've upgraded to their newer versions at least 4 times maybe 5. I am using CRM 2015 Group Edition. It has never worked properly since they installed it. The last time they attempted to correct the problems they said that they would have to uninstall it and re-install it. They are now saying that I am only a 'silver' subscriber and that I have used up all of my support time and that I would have to pay $800+ do get them to fix what they have been unable to get right all along. I am considering taking them to court as I no longer care about the wasted time and money.