Summons under wrong Name

[cheetah]

My husband took out an unsecured line of credit and His father and he was a "personal guarantor". The name of the S-corp. was say Business A. They used the monies to try to salvage the business and increase sales. Importunely, the business went under and closed its doors. Since then my husband and I started a new business called Business B. It's a completely different business than A. We were making the payments for Business A for the business line of credit but started failing behind in the payments. My husband and Dad are being sued by the creditor and on the summons papers its states Business A , aka BUsiness B. This is not correct. How should we file our answer to the summons to the debt? Since Business B nothing to do with Business A, can the case thrown out?