If they won't talk to me on RM, initially, I move on. Why? Because of a provider who, a year ago, took my emails where I mentioned what I was looking for, got my real name and posted all of my half of the conversations all over my social media because I chose not to hire him. So, I stay on RM until I can tell they are sane and then, when we have some level of normalcy, I am OK to switch to What's App or text. I may miss a provider or two who refuses to chat on RM, but if it saves me $1,000 having to hire an IT professional to block some nut job, it's worth it.