i want to add funds to my apple icloud but i am told to contact apple support

This is primarily a user-to-user support forum; other Apple users like you.

Contact Apple Support. See: Contact - Official Apple Support

I want to add funds to my apple iCloud from my debit card

If you have a valid payment method on file, instead of buying or order an App Store & iTunes gift card, you can Add money to your Apple Account balance anytime, no gift card needed, see -> Apple Gift Card - Apple (UK)