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If you singed personal guarantees, you're obligated to the companies for any debts incurred while you were in the business. Any debts incurred after that point would not be yours and you would be entitled to indemnity from the other owners for those debts.
Also, your agreement may have a clause in it that says the company relieves you of any obligations, or that it assumes your part of any personal guarantees/obligations. If so, this would give you another claim for indemnity from the company.
In Alabama, the statute of limitations on an open account is 3 years from the last payment or charge. Thus, claims would be barred only if the accounts have been dormat for more than 3 years.
You or your attorney should write a letter indicating first that the debt is barred by the applicable statute of limitations. Also, you should send them a copy of your agreement showing that your responsibilities were assigned to the new owners, and therefore, you're not responsible for the debt.
It will likely take a letter from your attorney to get them off of your back, although the Fair Debt Collection Act does allow you to send them a letter demanding that they not contact you anymore.