Seems like a perfectly reasonable response tbh. The only thing that struck me as bizarre was it taking a month before you realized they were avoiding you. I'd say the conditional distribution of someone avoiding you looks like this:

1 unreturned email/phone call: 70%

2 unreturned emails/calls: 95%

3 unreturned emails/calls: 99.9%

And the first one honestly is probably even higher than 70%