Xfinity Mobile bill not applying credits that I have in my confirmation email.

I purchased a buy one line get one line for $40. I brought 2 phones and recieved a $10 credit for BOTH lines. Bringing my total bill down to $20.

Then we added an additional line for $20 and did one of the "free" phone promotions for that line. (Essentially just applies a credit to cancel out the phone charge every month) 

So now my bill is $40 for 3 unlimited lines. I added a protection plan to the new phone that was $12 bringing my total to $52. After the $6 or $8 in "service fees" my bill should be no more than $60!!

The first bill I expected the extra $75 (3 $25 activation charges) meaning my bill should have been about $135.

It was $174.54!!!! I talked with 3 different representatives and was given a different answer each time. The credits weren't applying right, it takes over 30 days for the credits to apply, Yada Yada Yada. Then was promised that the next month would be corrected. 

Surprise surprise, it's not. This month's bill is 90.25. So again I get ahold of a representative. They apply a $20 credit for the BYGO bringing my bill to $70.25 but it's still $10 higher than it should be because it's not applying the $10 credit for the second phone we brought. 

Can someone please correct the overcharge for this month as well as last month's and get the system corrected!!!! I have the emails showing what I signed up for and what the totals should be.