I just purchased less than a week ago two 7970 cards and found the same thing with them. Anyone buying used AMD cards should ask if this is what they will receive and the sellers should note this in the description.
I must say I agree with everything said here... Hope this gets worked out and I think it will with alittle more time given to the OP and MSI to sort this out. Im a fan of MSI so I hope things get sorted out for the OP.
Could you use a range extender to connect to the existing WiFi that is being shared and then it will re-broadcast the connection in your apartment as your own WiFi connection separate from the shared WiFi in your building.
This would give you control of the WiFi connection you would be using...