HDFC Bank — Debit Card Reward Points in Negative

As per the Bank's T&C, for using my Platinum Debit Card for making a payment, I should get certain rewards points based on type of merchant.
Now suddenly I saw that my points are showing as negative balance(-500) and this is happening 2nd time. This is happening only in this Covid time. I use to spend a lot in my account and I am eligible for the points but instead i received -500 points. I complaint against this to my bank's Virtual relationship manager but no luck.

I reported this thing to many times but no luck. Also from last 1 year I haven't received any cashback promotional points on spendings. I am having Salary Account with HDFC and I work in software industry. Now I am planning to change my salary account to ICICI bank.