That would be some sort of sound clip sent from your phone which is not covered for the message unless you have unlimited messaging as a feature. The data used for that, since it is a sound clip, is covered within the 100mb
Not too sure. Can you take a look ar your detailed billing/e-bill which you can access through Self Serve? You may want to email Koodo Customer Service because it's difficult for the community to help with account based issues because we aren't allowed to look into that or share personal information.