Cruise Control problems of the 2007 Toyota Matrix

Manipulating cruise control, i17 downhill unintended acceleration, no brake response, moved to rocky left shoulder, throwing rocks noisy but may have helped slow me but brakes would not depress, in some order? shifted to neutral, turned off key, emergency brake, brakes now working. Only time it happened, a few weeks later Toyota says remove floor mat, did that also quit using cruise control as often I think I use it a lot more than most people. Concerned now that both locally and nationally Toyota won't talk to me because my year (2007) Matrix is not on the recall list.