We did the same thing. We were fairly early and heavy users of the pagerduty API. We'd been using it for over a year and had integrated it fairly deeply into our SRE stack. When the renewal came up (we had a 3 year contract), they wanted to massively up the price due to our API usage. IIRC, it was more than 5x more. Our CTO had us port all of the tooling to opsgenie and we've never looked back.

I'm generally not a fan of Atlassian anything, but Opsgenie was really good before Atlassian purchased them and they're still really good.