What can you do against bank harassment when you are paying on time?

Hi

I have a credit card from a finance company and I have an outstanding of 10k. I am paying every month on time but from the month of March 2022, the collection department is calling me and being rude to me.

But finally now, before the due date, they messaged me on WhatsApp in a very bad way. The message is like this:

"Dear customer, Tomorrow morning your payment has to reflect in the system. We will not entertain any objection to late payment."

And I do my payment on time but what's this type of messages they are sending me.

What should I do with them for this kind of unprofessional and rude type of harassment?