many anonymous incoming call after 12 hrs installation. disappointed!

I installed n used talkatone last night. I also purchased the adv free at $9.99. however today I keep getting many incoming calls that I dont know who they are. I feel so annoying n cant expect this situation in this app. I tried to contact talkatone, they just cant help. disappointed.

SandyLaw about Talkatone: WiFi Text & Calls