I am unable to buy an Apple developer account as the application keeps rejecting my card and phone number

We’re other users, and some here are third-party developers. Not people that work for Apple.

Based on previous reports of enrollment issues around here:

You’ll need to associate a major payment card with the Apple ID, and not an Apple ID balance. No gift cards.

Some of the other usual suspects:

If you have an add-on VPN client app in use, discontinue and remove that.

If you’re using the developer website to enroll, try enrolling via the developer app. Or vice versa.

If you’re in India and using (trying) the website, you’ll need to use the developer app to enroll.

If you have a mobile number format Apple ID, those usually haven’t worked and an email-format was (is?) needed.

If you’re in an embargoed or restricted region or country, that enrollment won’t work.

If you’re a denied person, that enrollment won’t work.

If you’re in a country or region where Apple isn’t active, that probably won’t work.

If you can’t be reached via direct incoming international call, find a communications carrier that allows that.

Apple Gift Card and Apple ID balances won’t work for enrollments.

If one of those is not the case here…

Contact Apple Developer Support.

enjeck162 wrote:

I don’t have any embargoes or whatsover. I am trying to enroll via the apple developer application and I got stuck at the level of payment and phone number

If you’ve gone through that list of potential problems, then contact Apple Developer Support.