VA isn't covering urgent care cost

First time using urgent care two weeks ago. Woke up with white spots in throat and got diagnosed with strep at urgent care.

Today I get a bill for $400. On the bill they said since I had no referral, it's not covered.

• I am 60% rated
• I visit the VA a few times a year
• I used their tool for an in service provider

So yeah, I meet the requirements as far as I know.

I didn't call within 72 hours because that's for ER visits

So yeah, any advice on what number to call?