Dispute with Bath Fitters Orlando. They agreed to refund what we paid. They requestin return of Tub installed at no charge.Do we have to return?

Hired Bath Fitters of Orlando to cover tub with their product. Few months later water is between the old tub and the new. They came to fix it. They drained the water and chalked it. 2 weeks later water back. Back 2 more times to fix. 4th on site tech twisted the water spout trying to get it off. Gave up on taking it off. Drained the water again and said they fixed it but not to run water for 4 hours. 8 hours later turn on shower and water all over inside the wall. They broke the pipe in the wall. Water went in adjacent bedroom. Manager comes out and offers to pull the tub out and replace at no charge with a brand new tub. We had to repair all the tile around it at our cost. They seemed sincere wanted to make us happy. Replaced tub. We did tile work. 2 weeks later noticed that the tub does not drain all water because of a low spot in middle of tub. We requested money back. They said they will refund what we paid but want the free tub back. They can not return our original tub.