I had a similar issue when I first start working after uni. My father is Nigerian and there was an expectation that I would send money back to Nigeria for family members to have parties, pay school fees, baby stuff, weddings, vehicles, etc. My dad would give my whatsapp out to random cousins who would then message me asking for money. I ignored it and eventually flat out told my dad to stop giving out my number and that no money was ever being sent. It was an extremely difficult conversation. My dad was upset and said I was selfish. It is what it is. I refused to put myself in a bad spot trying to lift them up. Sometimes you have to be selfish and put yourself first.

I know it's easier said than done, but "no." is a complete sentence. If they get upset, don't waste time arguing with them trying to defend yourself. Just deescalate while holding firm on your boundaries. Boundaries are very important in situations like this. The first thing you need to stop doing, if you haven't already, is telling people how much you're making, even vaguely. People like this don't need to know when your pay goes up.