Yesterday, I opened a new line under my existing account with Tab Large. I wrongly chose 6GB instead of 2GB. Self serve at home won't let me to change the plan until next billing cycle which is mid-January. Can the mistake be changed within 2 days of activation? Also, I was told ( by Best Buy) that adding a new line can be awarded a discount of $5 to the plan. Is it true? I don't see it in my account. Maybe I misunderstand it. Thanks.