My skateboard is "damaged"?

Alright so, I just bought a mini cruiser from Big 5 (I know, not great for skateboards) but I bought it. I paid about 50 bucks for it.

I go home and try it out and the first thing I notice is that when I push off, the back makes a clanking noise.

So I looked, and noticed that where there trucks? ( metal "T" thing) goes into the black plate that's attached to the deck, is not securely placed. It's loose. So I can physically move the whole truck left and right.

The front truck is fine, but the back is not "molded" in to stay still and straight.

What can I do? It's annoying and I know it's prob a pretty cheap board but I don't have money lol

Should I take it back and get a different one? Is that a good reason because I don't really think so...

Help?

Thanks! No rude comments please.