Bad luck about the bike - I’d try taking it back to where you got it. You’re only just outside the month and it’s a serious problem so if you’re nice (which I’m sure you would be!) they may at least fix it for a reduced price.
I guess if you’re going to get another bike, the best thing is to go shopping with someone who knows a lot about them. I’m sure there are bargains to be had, but like you I wouldn’t know a beat-up but sturdy bargain frmo a beat-up about-to-fall-apart money pit.
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