Dotsure refusing to pay future eye accounts

I registered my rescue Pekenese with Dotsure ten days before my 1st appointment with eye clinic. Because I knew of the 30 day waiting period, didn’t submit the account. 6 months later I submitted the next eye account and they are refusing to pay for any eye appointments going forward because the diagnosis was made before 30 days after joining Dotsure 6 months ago. Pekenese are known for eye problems.