The messages team doesn't want to talk to you. Their app is used by 1.5 Billion people.

If just 0.1% of them had some issue with their app, that would be 1.5 million phone calls.

There are ~3 people working on the messaging app usually. Thats half a million calls each. Thats 52 years to answer all those calls!

The TL;DR is that you will never make a bugfree app, and the remaining bugs will always leave some unhappy customers. At some point the team needs to decide that they need to move on to making new features rather than bugfixing, and that point is well before they start talking to random users on the phone about rare bugs. Sorry - the app isn't for you - go use another app or another phone.