Why did I not get all of my money?

I was supposed to get over $3000 back on my taxes but I ended up only getting about $230. When I went to the IRS website to see what happened to the rest of my money, it gave a list of possible reasons as to why the refund amount was adjusted. Non of the reasons provided had anything to do with my situation. I try to call the number on the IRS website to try to speak with someone but no one ever answers. This has never happened to me before and I just want the rest of my money that I was supposed to receive on my tax return. Can someone please help?