Customer service

I ve been contacting customer since last month about some changes to bill to make payments easier.  I had ask for certain dates as it would allign more with pay date but when I check in new cycle due date hadn't berm changed as well as some device actions

 Contacted customer service about every two days and got that standard working together crap. Be told one thing but opposite action taken.  Then icing on the cake came December 15, 2024 when it seed I was being charged double but agent tried to convince me I didn't see what I thought I saw...not then about departed chat a awhile before t mobile was to still be open. Totally unprofessional