nothern ohio automotive Incorrectly built a tranmission and wont stand behind their work mentor Ohio

we supplied a manual transmission to nothern ohio automotive to have rebuilt, after they charged us a large amount of money the transmission leaked and would not perform correctly, after this shop was not returning our phones call we sent it to another reputable repairer it was found to not have been asembled correctly and not fully rebuilt, upon making many calls to Northern ohio automotive which they refused to return, we finally got to speak with someone and they told us to sue them, please be warned about this business they do poor workmanship and do not stand behind their work.