Comentity bank

This is probably kinda weird but has anyone dealt with bad debt with comentity bank before? I've tried to work with them to get my debt paid off and they agree to allow me to pay what I can and then tell me I'm lying about having more money than I do and won't let me pay, etc. continuously harass me and threaten to sue me so I'm not sure what to do at this point? Has anyone ever had any similar experiences with this company or anything like this and wouldn't mind sharing what has happened? It's causing a lot of hell in my life and I know it is partly my fault but they're just awful.