Wal-Mart Telecheck TRS Someone else wrote checks on me, now telecheck/trs says they're coming after me! fairfield ottumwa, Iowa

Someone stoe a book of my company checks and wrote more than 17,000 worth of checks on my account, and although the bank returned 11,000 back into my account I am still left with a debt of 6-7,000, and an additional debt of roughly another 30,000 from other businesses. Now TRS and Telecheck are threatening to come after me for the difference. I told them I am suing Wal-Mart processing my checks without my authorization. Since I was neither the signor or on camera (since I didn't sign these checks). I'm not too worried but any help will be appreciated. I was already told by an attorney not to let TRS record any conversations as they will just try to use them against me.