Can my 2nd employer enforce the non-compete against my 1st employer?

I went to work for TCi in Apr '11 as a Business Development Manager to grow the trailer repair business. I signed a non-compete agreement with them upon acceptance of offer. In December 2011, I was approached by Bob Sumerel Tire Co. and was offered the position of Dir. of Mechanical Svcs to improve their trailer repair business. Sumerel Tire being a much smaller company decided they weren't ready for my position and terminated my employment on July 26, 2012. TCi, rehired me for the BDM position. I received a letter today stating that Sumerel would take legal action because I was in violation of the non-compete. My whole career has been in the transportation business, this is all I know, I feel they are limiting my ability to find gainful employment enforcing their noncompete saying I cannot be employed by any competitor in any fashion for 2 years. Had I known all of this, I would have stayed with TCi and never went to Sumerel in the first place! Please help!