GOOGLE ADS

Hey guys. I hope someone can answer my question.

I am running a few search ads and call-only ads. But last month, July 17, our website went down for maintenance. We can still receive calls until July 19, 2 days after the maintenance. Then from July 20 onwards, that's when we got 0 impressions and calls at all.

What's the best explanation for this? Can the call-only ads still run without the website? Please help. Thank you!