Itsworthmore.com Offered the highest dollar for my Iphone 5S off then, said my phone battery was damaged and offeres much less! Sanford Florida

I sent an IPHONE 5S to this company after they offered me 98.00 online. This phone was in pristine condition and I used it up to the day I sent it to this company. I have had absolutely no problems with this phone whatsoever. 

Several days after they received my phone,  the company emailed and said I had a swollen battery and that the battery would not hold a charge and that the screen was lifted up on the left side as a result of the battery being swollen. They downgraded their offer to 78.00. 

This phone was immaculate  and I know there was no problem with the battery because I used it every day. The screen was not lifted and if fact was like new, I cleaned it before I sent it to them and there was no "lifting " of the screen. This phone was always in an Otter Box, covere, protected  and did not have a scratch on it. 

After reading other reviews about this company, I feel as if I have been mislead like so many others. I have refused their offer and they state they will return my phone. It had better be in the same like new condition I sent it to them or I will follow through with the BBB and legal processes if need be.