I'm not sure why you've chosen to take offence, but that's your prerogative. I'm always willing to acknowledge a mistake, and have looked for the more expensive set, which I assume is this one:
Mapp And Lucia Collection - The Complete 1st & 2nd Series [DVD]
In which case, it shows the same running time of 500 minutes, that is, ten 50-minute episodes. Is this the set you mean, and can you specify any missing bits? It really isn't enough just to say "It is incomplete and that's all there is to it."