Atlantic Tile, Kitchen & Bath

We signed a contract with Atlantic for a kitchen remodel on 8/29/19 with the work expected to complete within 5 weeks, with a buffer of 3 weeks. The work was finally "completed" on 11/19/2019, with a few items left on the "punch list" - which included the completion of the back splash. Within 12 hours, I had received no less than 10 calls from them for payment. I was not ducking their calls, but the 12hrs were during the evening and workday. At 3pm on 11/20/19, I received an email threatening to send the account to collections for non-payment. This is unbelievable - it had not even been more than a day and they were sending threatening emails??? Once I had a free moment, the balance was paid that day.
For the next many weeks, I reached out several times to get a status on the punch list items. I was told they were having issues cutting the back splash tile to the size needed to complete the work. I got an email on 12/2/19 indicating they ordered a special blade to do the cuts and would be ready to finish the job shortly. So we waited...no additional word for the rest of December. I finally get an email on 1/5/2020 that they have the tile ready. They come out on Jan 6th to do the installation. Once the work was done, I was told to give it overnight to "dry" and then to clean the tile. So I did...and the work was INFERIOR. Jagged edges, broken pieces (have pics). I immediately sent an email to the manager, *** Y (my contact for all emails), expressing my concern and disappointment with the inferior work asking that the work either be redone or they need to come up with other options. I even provided them with a possible option.In the meantime, I'm once again getting calls for the final payment (about 1K). I never received a response to my email. And on 1/15, we get a certified letter and phone call once again threatening collections. UNBELIEVABLE!! We have been beyond patient and have been open to working with them. But they are trying to bully us into paying for unacceptable work.