Fraud/Billing

I’m a Sprint customer and have a business account with multiple lines.  I was forced to upgrade to new devices because of the network consolidation.  I traded in four phones; an iphone, S8+, S8, motorola.  I was suppose to get a monthly trade in discount of $400 over 30 months for the iphone and $500 over 24 months for the S8+ based on the promotion I signed up for.  Now I’m in to 3 billing cycles and am only getting $200 based discount for the S8+ and no discount for the iphone.  I’ve made four phone calls so far to their billing and accounting customer support.  Promises, Promises and no discounts.  You have to wait to the next invoice to see what changes they make.  They can always successfully add services to your account, but never in my experience apply removal of services.  They also screwed up changes to protection services on my account.  Removed some from lines where they were not requested and added to a line I didn’t request.  The next billing cycle they credited me less for the removal of the protection service than they charged me the previous month.  It took three phone calls each over an hour plus to finally get them to remove a line that I requested.  Never deal with the call centers outside the US; they are totally unethical.  At this point I’m not sure what to do.  Thinking about filing a complaint with the Illinois attorney’s general office and any other consumer agency I can find.  Is this really how you want to treat a customer?  Either they hire totally incompetent people or they are telling them not to apply these credits and lead you on.  Totally unethical.  I would be ashamed.  They’ve added stress to my life and if it affects my health I’m going to file suit for that as well.