I'm having the same problem. Transaction did not go through try reentering your information. I pay by credit card through self serve every month. Same card, did not change any of my information. Account is under my name, so is the card, billing information is the same on both, it's a Canadian credit card, and I've been using it on here for about 3 years.
I'm having the same issue. Canadian VISA credit card. Same one I always use. Same information I've used every other time I've paid. I tried to pay with another bank's VISA credit card and it wouldn't take it either. I'd love to pay my bill on time Koodo! But I've only got seven days. Update us as to what's happening please! How can we pay our bill?