non-compete in name of old company, not new parent company

I sold my minor stock to my partner. He sold to a larger co. At acquisition,I signed a covenant not to compete with my old co., which , with the acquisition, became a subsidary of the new parent company.(contract is in the name of old Company, not new parent co.) My consideration was my employment as manager, a job I already had for 5 years when I owned part of the old company. This new Employment agreement was for 5 years. Non-compete is two years once I leave the company. I was hired/promoted to a corporate position within the parent company after 5 years. In new role, my responsibility is for over 30 subsidary firms in several states, including my old firm, but essentially ending all local community and customer ties of former company. I thought I fulfilled the noncompete 2 years after I was hired/promoted within parent company with new role. I left the company entirely 10 months ago and now have started my own company of the same nature in the same county of my former company. Since I fulfilled the 5 year employment agreement as manager of my old company, and was promoted within the parent company to a totally different job and function requiring frequent travel (held 4 years), have I fufilled the 2-yr. non-compete if technically it is within the same company? What about the fact that my contract was with the old company, not the new one? They don't think so!!
Awaiting patiently.