Oxbridge Academy not worth the time and money

I completed a diploma through Oxbridge in 2011. Now when I ask for information regarding this I am told that you can not help me? When I ask to speak to a manager, I am told that Oxbridge managers don’t speak to the students over the phone??? So basically I wasted my money and time competing this diploma through Oxbridge then??? You guys are seriously useless and I will make sure I put this message on all available social media platforms.