Corporate Debt

My situation is complicated. Six years ago my spouse and I seperated. Within hours I was voted out as a director of our limited corporation although I did remain a partial owner. Because I was not a director, I was unable to have any influence on financial or legal decisions made by the company. My spouse spent recklessly and failed to reincorporate our business. I had no way of knowing that the business was not reincorporated and no way of forcing reincorporation had I known of his oversight. Eventually the business went bankrupt and my ex – spouse filed for personal bankruptcy. I was held personally liable for some business debt that I had signed personal guarantees for. My question involves utility bills. I had not signed personal guarantees for these debts. When the business failed to be reincorporated, by default it became a sole proprietorship of which I owned half. Two utility companies have filed with collection agencies to collect money owed by the business from me personally. I have continued to assert that I am not responsible for this debt as I did not have the ability to choose how money was spent or whether or not the business was reincorporated. Now the colection agency has filed a collection notice on my Equifax credit report and has started sending me threatening letters. The amounts owing are likely too small to warrant the collection agency to seek judgement against me yet large enough that I would suffer hardship if I was forced to pay. Any advice would be appreciated.