I take the bus a lot. (I don't own a car, it's not feasible for me to do so). Mostly, I sit in my seat and I read or I check my phone, people tend to leave me to do my thing.
However, in the past few weeks, I've had to deal with a few people (male - I look generally female/feminine) who think that the fact we are on the same bus is enough for them to chat me up. Normally, me not paying attention or engaging is enough, or a polite "I'm married" shuts them up. However, I've run into a couple cases where that's not been enough - they continue to invade my space, try to flirt, etc. I've tried just getting up and moving to another seat, but sometimes, even that doesn't work. I've had a couple cases now where the person is on the outside, so they need to move for me to move. I've asked them to let me up, and if I don't lie and say I'm getting off the bus, they refuse to let me move.
If I do lie and say I am getting off the bus, once they notice I'm not actually getting off the bus, they keep trying. It's not really enough to be considered harassment in the sense I'd get the driver involved, but it's enough to make me feel super uncomfortable.
What sort of responses can I give to them to make it very clear I'm not interested, without sacrificing more info about myself (real or imagined)?