SMS duplicates and Voice over wifi - Redmi K20 Pro / Xiaomi Mi 9T Pro Questions & Answe

I have two Redmi K20 pro running miui 12.5.1 in Mumbai, India on Vodafone Idea network.
For quite a while everytime I sent a SMS the receiver would receive 3 delayed duplicate messages and I would be charged for three SMSs. Same issue on both phones.
Today I figured out the reason. If wifi was on this would take place. However, if wifi was off then SMS would go immediately and only one message was received.
On digging deeper I discovered that the culprit was Voice over Wifi.
If I disable Voice over Wifi the SMS is delivered immediately.
If Voice over Wifi is turned on then there is a delay and receiver gets 3 duplicate SMSs.
Since there are no further updates does anyone know of a fix??

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