How to stop carrier info messages?

Idea, Vi (Vodafone Idea)
Hi, I just recharged my idea sim after swapping for a new Vi sim. VoLTE wasn't activated by default, but a call to the customer care did the trick. However, when I try to send an SMS, it immediately follows up with a carrier info alert [PFA screenshot], displaying my balance. At this moment, the network fluctuates from 4G to 3G to 2G, and then comes back to 4G after a while. I am using Redmi Note 7 Pro. Any leads as to how to resolve this issue? Thanks in advance.

(P.S. I have deactivated flash messages, disallowed push WAP, as well as activated full DND on my cell)
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