Airtel Failed to Update My WhatsApp Number After Changing SIM

I am using an Airtel mobile connection and earlier my WhatsApp account was registered with my old number 93106838**. I am no longer using this old number and now my active Airtel number is 87963649**, but I am facing problems because my WhatsApp is still linked to the old number and I am unable to use it properly. I request Airtel to help me resolve this issue by updating my WhatsApp-linked number to my new active number or by providing a proper solution so that I can use WhatsApp without any problem. I expect this issue to be checked urgently and resolved as soon as possible.