Refusal to process credit

agreed that I had been mislead by the rep back in June and she agreed to give me a $200 credit towards the ipad as shown in the email below.  She told me it could take a few days.    I never saw any credit and have called at least 20 times with  everyone assuring me credit was coming but might just show up on my credit card as $200 credit but that I would definitely receive it. I never did.  Went back to locat xfinity store and they looked it up and showed me the $200 credit in the ledger on my account but they told me they could not apply the credit towards outstanding balance or put on my credit. They stated only customer billing could do that. 

Called back this week several times and everyone assured me credit was coming, but of course it never did.  Finally today, I spoke to a woman this morning who for the first time tells me this story.  That I need to call in monthly prior to my bill being due and have them manually credit the $20.83 due each month until the $200 credit cleared.  I informed her there was no way I was calling monthly to do this.  I told her I wanted the $200 credit applied to outstanding balance on i pad or issued to my credit card.

She kept me on the phone for over 30 minutes and then said she was still working on it and could call me back when she figured out a solution.  I agreed.  Of course she never called back.  Called again late this afternoon and then this rep tells me that yes I would have to call in monthly to have credit applied.  I told him no way and then he says that I CAN return the ipad.  This after 4 people told me I could not, which is when I opened the Ipad up and started using it.  He gives me an address to send to and then says I will receive full credit once the unit was received.  I then said, I need you to email this information so that if I decide to return the unit, that I have proof of the instructions given to me.  He then tells me he has no way of emailing me which I don't believe. 

I have been a comcast customer for over 20 years and I am not the type to complain but this has literally been the most ridiculous episode of lies and incompetence that I have ever experienced.  I have spent 20 or so hours on the phone with people and 

only a couple of reps have even been remotely helpful.  

At this point,  I really feel that the current balance of $473 for the ipad should just be credited off, but at the very least, the $200 credit promised in below email, needs to be put toward the balance for the ipad or put on my credit card which is on file.

Surely you have some ways to look at all the calls I have made to see the insanity that had happened.  There was one ticket made that may have more info but honestly I don't know because every time I called, the reps acted like it was my first call.  That ticket is [Edited: "Personal Information"].

I need someone to respond with a proper solution