Worse finance company on Earth

My Fiance and I bought a Jeep after I returned from basic training CPS was the finance company. This company is the Devil incarnate they consistenly harass and never give breaks. We are paying off our loan this coming week with taxes and look foward to telling them to go f*** themselves. At this point they have assessed so many fees on our account that they total over 1000 dollars they called my sister; which my name is not even on loan so how the heck they got my sister phone is totally unknown to me, and complained to her about out late payment. I really do not discuss our problems with my family and so they took the initiative to do it for me when it was not even my loan. We have put up with these people for 5 years now and cannot wait to be done with them forever, I hope this company sinks, I wish nothing but bad grace on them and I let everyone I talk to about this topic know how horrible they are.