I'm reading this now, and I can tell you that personally, the best way to contact me is on your phone!
Text, call or whatsapp!
I always have my phone on hand and answer all messages when I'm free!
I respond to PM at the beginning of the day or late night!
And even if I negotiate with the client through these, I do not accept appointments through PM.
I need a quick and direct way to contact the customer, and this is much easier over the phone!
Maybe the girl you contacted has the same rule!
Or she was just busy during those days!