I had a engine put in by pep boys and it took them...

I had a engine put in by pep boys and it took them 3 months to get it done now that I got my vehicle back not even a month later my engine Seized up on me so I took it to padlock and they told me that whoever put my engine in didn t do it right they Welded bolts where they weren t supposed to be there we re missing bolts where they were post to be and they put my power steering line wrong side so I had it towed back to pep boys and now they don t want to do anything about it I don t know what to do if anyone can help me in what to do please help