The thing is I actually got accepted into the post grad diploma that I was interested in, however I was informed that all the seats were full so got transferred into the regular diploma course.Those with undergrad degrees typically take a post graduate diploma - not a regular diploma.
The regular diploma course contains the same topics as the post grad diploma (plus some more topics) so that's why I'm happy with it too. But ideally I would have liked to get into the post grad diploma. Is this a good point to mention in the statement of purpose or should I just leave it out?