Swiggy — change in phone number

Address:

Chennai, Tamil Nadu

So my previous phone number is registered with Swiggy. However, it's deactivated and now being used by someone else. However, my email id is still linked to that phone number and so are my credit card and paypal details. I'm not able to login with my email-id and change my registered number because there's no option for that.
Extremely worried about transactions being made from my account because of this Swiggy glitch.