Hey,
Twitter is notoriously bad at giving back accounts, the length of suspension and their leniency does depend on the reason for the suspension though. I was (supposedly) permanently suspended for impersonation (my profile picture was a picture of a celebrity and apparently this was enough to warrant permanent suspension) I lost the account for about a month, as when you appeal you just get reviewed by bots (I.e. it never goes to an actual human for you to have a straight answer). I only got my account back when I submitted my passport photo and told them explicitly who I was and that I definitely wasn’t a celebrity, and that was after a ridiculous tug of war trying to find out how I was suspended initially. I was told I was very lucky to have this outcome, though.
If they are letting you log in (albeit with a phone) you’re restricted though, which is slightly different - I think they DO actually lift restrictions. The bad news is, you say you’ve appealed/been in contact multiple times? Don’t! Worst thing you can do for yourself - when you reappeal against a current, ‘open’ suspension they put you to the back of the line again. So say if your case was due to be reviewed tomorrow, but you email today pushing, you get pushed back for however many weeks or months. I have heard of friends of mine being restricted (due to age) and then unrestricted again but this is months, even years, after the initial suspension.
Your best thing to do is wait, honestly. If you desperately want to, make a new account, fly under the radar a bit (don’t do whatever it was that got you suspended initially), and wait, and at some point in the next year or two they might unlock it. Yes, seriously. Otherwise, man, just don’t use Twitter, their suspension policy is a pile of crap.