Hey all - thanks for all the advice and what not.

I went and talked to them today - I went all prepared with my signed lease, a run down of the tennant law from a building inspector friend and a number to an attorney if need be and well.... I'll just say they backed down in a hurry. She back tracks and says she must have added wrong and got $755 instead of $685 when she added $30 to my last amount... which makes no sense but hey, there was no conflict so I'm happy.

Thanks again for all the help!