Welcome. But once they have fully locked, with the maintenance that salons do, you may not have mush hair left to take care of. If they used any products, it'll a years before they lock up. If they do at all. Wax prevents locking. It gives the impression that they are mature by being hard. But they aren't.
I didn't see anyone say they used wax. But if they did. That will damage your hair. The wax needs to come out to have actually healthy locks. Wax is the main cause of mold and mildew growing in your locks.
If all they do is palm roll, you're wasting your money. First, that can be done for free at home. Second, it should NEVER be done. It only does 1 of 2 things. Either it does nothing, and it has to be done over and over every day. Or it does create knots which means you are irrevocably destroying your roots. It's a damage that doesn't show up right away. it shows up later as you your hair grows out.
And if they are palm rolling your hair, I'm sure they put products in it. The only reason to palm roll, and see it stay flat for a while, is if there is wax in there.
What other methods did they use? It'll be hard to help you fix anything without knowing what was done over the year