Get an error, please enter a paid number

Hello, I accidentally deleted my Blizzard cell phone number. And I wanted to get the exact same number back and I get an error, please enter a paid number.
It is important for me to note that the number I accidentally deleted is the same number that I am also trying to get back. I spoke to my provider and he said that everything remains the same. And my mobile number is set to Not VOIP

even if i try to use different number of my wife and my son i still get error please enter a paid number. and they get different provider both of them.