First, are you sure you have Mix package and not Mixit? I only ask because Mix is quite an old bundle, no longer sold - and Mixit doesn't include these channels. You can check the "channels in which package" guide at the bottom of this page
Second up - when you say you "can't get" these channels, what happens when you try to? Are they greyed out in the guide? Or are you getting an error code/message when you try to watch them.
If they're greyed out and you have a TiVo/V6 box, then try following Home > Help & Settings > Help > TV Care > I'm missing some channels. This self-service refresh takes perhaps 20-30minutes to complete and makes sure your channel selection matches your package.
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Hi @Rogman, thanks for your post although I'm sorry for the delay in getting back to you.
Apologies too that there was a mixup with your package - I'm glad to hear we've got things sorted for you now though, but please don't hesitate to post back in here if you need any further help with this topic! Many thanks