No credit card required
Browse credit cards from a variety of issuers to see if there's a better card for you.
It says you need a number can you get that from score watch or the report thats on your score watch?
I presume you are intended to file an on-line dispute, and that you need a number for that process?
If so, I might reconsider. In view of the CFPB's recent directive on CRA disputes that they will hold the CRAs accountable for forwarding all information to the furnisher, I personally would not sanitize my own dispute my limitiing what I can provide to only what their on-line form permits.
I would send it snail-mail, wth all supporting documentation and arguments.