I've been hit by a few T busses also.
Once, pulling around a T bus to pass on the left at 23mph, bus pulls out into my lane, pushing me into the opposite lane (oncoming traffic), but luckily there wasn't much traffic. A SHARP left turn, and I pulled off the main street and down a sidestreet, avoiding death that day.
Another time, I was squeezed between a bus and the line of parked cars, and when the bus pulled off to the right for a bus stop, I was sandwiched between the bus and parked cars. I clipped and took off a car's mirror before I stopped.

I've never bothered to write letters, usually a few sharp blows with my U-lock on the side of the bus suffices.