AWS Traffic Woes

So, we seems to have a problem with traffic going to AWS. Not that it is blocked but is severely limited. We don't peer directly with AWS but peer with someone that does. Traffic seems normal going through our peer and then when it gets to AWS we lose visibility and can't see what is slowing it down. If we change to a different public it seems to resolve the speed issue. I was hoping someone could help me get in contact with someone over there? Looking online there isn't a number that they post. I work for a large education organization covering about 100 school districts so "just change your publics" isn't so much of an answer unfortunately.