Since when do music video plots have to match the lyrics more often than not they don't
I guess it's up for everybody to decide but you could make a case for telephone (the song) being about Gaga trying to break away from the pressures that are brought upon her from everywhere (management, boyfriend, etc...) and so in the video she breaks free from prison (those pressures) and just does her own thing, no matter what others say.
That's just my two cents but you could certainly come up with tons of other interpretations. Or you could just enjoy it for what it is and not think too deeply into it, because maybe Gaga herself didn't think too deeply about it, who knows. That's up for everyone to decide for themselves.
When it's an extremely long video with a plot more like a short film, yeah, they usually are supposed to match.