Sorry you are having trouble, and hope it gets fixed correctly or replaced.
Interestingly, I had a motorguide that came with my Triton...nothing but problems. I replaced with a Minn Kota. I also put a Minn Kota on my War Eagle...no problems. I am fairly rough with my TMs in the laydowns and surprised they have held up so well. Even with all the stray fishing line I seem to collect with my TM's 
Again, I hope they get it right for you this time!
Triton 190FS, 200hp Optimax, HB 798C HD & War Eagle 548LDV, HiTek, 30hp Mercury, HB 998C HD
Fishing is a privilege...catching is a bonus. Enjoy each precious moment we have to experience our great outdoors!