Hey hun,
I have had mix up with meds before, as I think a lot of us possibly have but stopping taking meds so quickly will have negative side effects usually, so I think you should either do what Farmergirl suggested and ask your pharmacy if they will give you a few to cover the next few days until everything gets sorted, or if possible could you pay for them this one time or is it too expensive? I know you shouldn't have to but being ill may not be worth not paying...if that makes sense?
I understand why you are angry, esp when you had already made enquires and got a call back saying that it was all taken care of, only to find out yet again that it wasn't. I had hasstle a while ago when my clinic was trying to change my meds without telling me!

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I hope you get this all sorted out soon