Hi Wendy,
Thanks for your patience, sorry for the delay in our response. Are you still having issues receiving calls?
If you'd like to buy more phone numbers, this guide may be useful to you:
https://www.ringroost.com/how-to-buy-phone-numbers.php
This help video walks you through the steps of buying more numbers:
https://www.ringroost.com/help-videos.php
I hope this helps. Let me know if you have any lingering questions about that.
Warmly,
RingRoost Support Team