How to disable spam URLs from being counted towards the free 300,000 DNS queries limit?

Hi all,

I've recently moved from Adguard to NextDNS for better control but I'm facing a weird issue. The top 3 blocked domains are being spammed from my Xiaomi (Mi) camera which uses up 33% of my monthly quota and this results into my free quota of 300,000 queries being used up in just 2 weeks.

Unfortunately, my ISP provided router doesn't have an option to block these urls. I've added these urls to DenyList and have also enabled cache boost. But still, every request to these URLs are being counted towards the DNS quota.

Can anyone please help? I wouldn't be able to move to the paid plan atleast for a couple of months, unfortunately.