Rear Suspension Shock Absorber problems of the 2000 Mazda 626

I am complaining about the transmission. I have had 3 transmissions to my car since I bought it. I am needing a 4th transmission. Shifts hard on downshifts to upshifts usually at 2nd gear. Makes a humming noise to the transmission. The dealer put 2 trans. In and the same is occurring again. Brakes are also messed up- squicks horrible even when I just put new ones, struts are all out, have had in my first yr of purchased, three transmissions, 1 air conditioner replaced, 1 roof liner was to short replaced, 1 recall, reverse sometimes works- you have to regear it to make sure it is on reverse-cause you don't want to go forward when you want to backwards, I have to at times put the gear in neutral to start my car- because it won't start on park at times. I am a very dissatissifed customer who will not buy another Mazda car again. My car needs another transmission to it. I have proof of all work done to this lemon from the dealers.