iPhone 6 iOS 8.3 - Callers get busy signal/tone and no voicemail
I can make calls - receive text msgs and iMessages - browse the web- check my email except for receive any calls- When people try to call my cellphone # ( Rogers - Canada ) it goes to busy signal doesn't even go to my voicemail. I tried resetting all Networks- did the Airplane mode- did a system reboot- I don't want to restore my phone Im wondering if there is something that I can do to fix it? Also DND is off as will- I have not received a call since Saturday night. I contacted my provider and they told me everything is good on their end- they told me to go to apple instead.
Any help would be appreciated please and thank you!
iPhone 6, iOS 8.3