After all the have screwed up they actually directed profanity at you too? That's absurd. From your story and the other that someone shared above, it sounds like they are sending products that were warranty returns out to other customers and hoping that they don't notice. I have heard about tech companies (motherboard companies specifically) doing this before. I'm not sure how they get away with it. Maybe contact the Better Business Bureau? I don't know how much they can actually do other than spread the word, but it may help to let them know that you plan on getting them involved.
I will quote what was said:
In a very angry and loud tone "I've dealt with this same issue every damn day for almost a year"
After this I stopped calling and reverted to calling Germany who is so far, unreachable.