I dont even know what I do

My new job is... different. I feel like I was tricked into taking it.
Mostly because when I was hired I was told that they were hiring 2 people for the summer. One would be a temp and one would stay on later. I assumed that meant they would decide on who they wanted to keep later. Nope. Im the temp, I found out on my first day. The 3 other admins asked me how long I was around for. I didnt know and was shocked that they didnt either. After working there for 3 weeks I finally got around to cornering the branch manager and asking when he thought my time would be up. He gave me a look that suggested I just caught him without pants and said he didnt know. Oook.... so... you dont know could be the end of next month or October...or never?? Can I have a clue? No? Ok....
There is also the matter of my job description. I was told my admin part of the job would be customer service. So bad debt calls for people who dont pay, welcome calls for new people, general Q&A that comes in. Noo... thats about 10% of what I do. The other 90% is whatever the other admins hand me that they cant find time to do. The only really good thing about this is that each one of the admins is taking a week long vacation over the summer at different times. None of them know how to do each others paperwork so I will be the only person who knows how to cover their shit when they are gone....cause I know all now...I think...well, I know what to do with the paperwork but I dont usually know why Im doing it because their system is ass backwards and redundant.
So..yeah...I feel like I was tricked and whats funny is the girl who was hired at the same time I was also feels she was tricked but all in all we just dont care.
As long as we get our shit done we can do whatever we want. We dont have to worry about anything after we leave for the day. And occasionally the techs buy us food. Sometimes we almost feel bad that we are being paid so much because there are days where we do very little besides file.
All we have to do is put up with one admin (who has been around for 11 years) constantly talking our ears off with gossip about the techs and giving us the stink eye when she has to stop texting and pick up the fucking phone because we are busy. We occasionally have to fuck things up to figure out how to do things because training pretty much consisted of being handed a computer and files and shooed off to make it all do something...and bugger if I know what that something is. And we do get the occasional wacko on phone, for example, this morning, when we checked the voice mail we found six long messages from a guy about finding Jesus. In each one he started talking a little bit faster to try and get his whole speech in before he got cut off. By message six you couldnt understand a damn word he was saying but he sounded damn proud of himself when he finished! So yeah, at least its not boring.