Right now I'm boycotting ebuyer, for having the most convoluted systems for administration, I'm on my 14th email/message in six weeks to get a refund on a £30.00 item, at the start I offered to exchange for the one I wanted, but I gave up in the end!
Before that I was boycotting Comet for a "No Hassle" extended warranty, that was just the opposie.
My next target is Sky, for having an impossible call centre and making me have an adult pin code, when I've no-one under 22 in the house. It would be OK, but it doesn't always accept its own pin - and is Michael Palin's pole to pole so obscene that our children need protecting from it? I could only find the naked bit in Finland, diving in to a freezing lake.