Shiksha.com — Spam calls because of this company

This is the worst and most annoying thing happening to me.

I signed up to Shiksha.com, it requires phone number for that so I provided them and now because of that I'm getting 15-20 spam calls from Universities every day to which none of them is relevant to me, you can understand how much irritating it is to receive such calls everytime you're doing something.

But it's not possible to remove my account from their website either that's why I'm making this complaint.

My Gmail : saranshtiwari.[protected]@gmail.com

I want my account to be removed asap, kindly take this into consideration.

Thank you