I had the same problem like I had an old number given I didn't have access to anymore... I found some e-mail and they replied me in only a few hours but I solved the situation before they replied...
What I experienced is if you keep trying to log in after a while the site don't ask for phone verification only captcha verification and I could just simply log in after a few attempts and change my number to a new one without any problem... it's like phone verification is not required all the time but just randomly for some login attempts... but this was 2-3 months ago I don't know what they changed since then, it might ask for verification every single time now
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