MICHIGAN UTILITY DECEPTIVE COLLECTION

I recently became a new customer with Semco. At that time, I was required to provide a $130.00 deposit even though I never had service with them. The account is in my name alone. I recently married and on the 1st bill, it stated "amount forward" in the amt. of $52.00 I discovered that it was from my husband-5 yrs earlier at a previous residence. He denied owing and said this was the 1st he heard about it.
If I understand the utility laws, Semco had no legal right to demand a deposit for service. Is this correct? They now say that if I want my deposit returned, I must have a guarantee. Also I must agree to put my husband's old bill on mine and be responsible for it. They are also stating that my husband is also a customer even though I never added him to this account, nor did he provide any type of identification. Do you have any advice? Already spoke with a rep from the Commissioner's office, who simply stated that my husband owed the debt. Period. The bill is from dates of service AFTER he moved out, but they're response is that 'he didn't take it out of his name!"