So, after semi-extensive testing, it turns out that RAGS was processing the command to give you the ability to call Britney just fine...but then not actually doing what it said it was. As in, the command to add the option to call Britney was running and executing perfectly, but then, for no reason at all, not doing anything.
As a result, I had to slightly tweak the way you get her phone number. Instead of just adding it to your phone (which would be the sane thing to do), you instead now get a piece of paper which, when you examine it, will add her number to your phone and destroy the piece of paper. It's a stupid goddamn requirement, but since it's not working any other way...
I also made it slightly easier to actually get Britney's phone number. Testing revealed that, even if you do everything perfectly, it still takes 28 days to get her phone number in the first place, which means you only have two days left to go to her apartment, which is hilariously not enough time in certain cases to finish the mission before Maria returns. So now you can get her phone number in 21 days. I may also alter things so that Britney goes to the bar twice a week (in which case, her phone number would be a little harder to get; balance!), but I'll look at that in a bit.
There are a few other bugs that I need to fix that aren't nearly as critical, but they should be relatively easy to fix in comparison, so there's no upload yet, but I'll let you know when the new version is ready. It will be later today.