Comcast Xfinity Stole $533.00 out of our account after agreeing to the 2 yr $159.99 mnth plan Nationwide

In short we got on a $159.99 month plan for 2 years in August Comcast had us set up automated payment and on Sept 5 2016 Comcast took $533.00 out of our account. When I called they had me speak to 2 supervisors and 1 customer service rep this took 2 hours between hold times and I was told I cannot get our money refunded for at least 10 days! Then a woman from the so called finance dept left a message on my home phone yesterday I have it saved because she stated they could not issue partial refunds so she is worried that if she refunds the entire $533 it will put my account at a balance of over $700.00. Ok I am no mathmatician however I am starting to wonder if these people are OK how in Gods name would my account then have a balance of over $700.00 WHAT! The online bill shows the October payment wih taxes is going to be $208.00 so call me crazy but given I am on the $159.99 plan how is it possible that I would owe more?! These people are crazy bottom line. I am literally physically ill over this my fiance doesnt even know they took that much money out for the first payment I cannot bring myself to tell him we have other bills! And now I may have to wait up to 10 days  and somehow if they refund me the money THEY OWE ME I will then be in debt $700 on an account we owed nothing on WHAT!? I seriously cannot deal with this just stay away from this company I have all the bills ,payments and voicemail saved. They are crooks there is just no two ways around it.