If I'm not mistaken that screenshot says that your friend accepted the offer. There a few condition koodo places on whether the referral is valid or not. Either way if you emailed them they should have gotten back to you. What email address did you send it to?
I would check the SIM card connection. Presumably your account is up to date, your bills are paid and it's not matter of being cust off.:-) If you need more help here is a link for someone who had a similar issue: https://c.getsatisfaction.com/koodo/topics/iphone-4s-no-service
Are you saying that you can't see the number that is calling? If you do see the number just block it through your phone. Even caller ID won't show you the name of the person or company on your cellphone.
I know voicemail is a "network feature" but is it possible that somehow your phone is "doing" something that makes this happen. We have a number of lines with them and 2 of them are set to extended greetings. So far we had no issue, although maybe we will see it happen too. I'm gonna test them.
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