Since now two weeks my Premium Interest should be increased. After waiting 30 days 7.5% should there be active. But on Earn BTC tab is still just 4.7% to be seen.
No need to open a scam accusation thread.
I assume you are holding 125,000 tokens and that's why you expect to give 7.5% annual interest on your balance.
Take note that it's not that the interest rate is increased to 7.5% if you hold 125,000 tokens for 30 days. The default interest rate is 4.08% and it should be increased by 7.5%.