How much is computer diagnostics?

In my case it was a "Double Charge" of $149.99 for the service performed! I have spent many HOURS on the telephone talking with people trying to get one of the charges refunded back to me. I have talked with robots and passed from one person to another(put on hold each time) only to be told I can't help you with your problem but will transfer you to someone who can! I spent over four (4) hours being passed around and the last time I was put on hold for 24 minutes-than got disconnected! Geek Squad tells me I need to talk with a BEST BUY rep since they are the one billing me and Best Buy rep says I need to talk with Geek Squad because they are the one who performed the service and charges for same. I am at my patience end on this matter! Please have SOMEONE that can actually help get this double charge corrected CONTACT me!!!!!