T mobile I chose paperless billing, and was unable to view my bills ever, website prevents change of plans Internet

I chose to change my billing cycle to paperless over a year ago with T-mobile. I started receiving bills that were significantly higher than I had previously received. I went to see why on-line and could not access my account. An error message was displayed on the website saying that my account could not be viewed at that time. Over a year with this service I was never able to view my bill online and see where these charges were coming from. I talked to a customer service person at one point when my phone was shut off due to not paying a bill that had doubled in size without my knowledge since I could not view my bill. This customer service representative was extremely rude and had no understanding for my situation. It came to light that I was using more text messages than my plan allowed for. This service call was extraordinarily frustrating as I had no explanation going into this call as to why my phone had been shut off as I was paying what I though I owed on time and had no bill that I could view or see any explanation. After this call I went to change my plan so I could have more texts allowed and found the website would not link me to any page or area that would allow me to change my plan. I had been a customer with T-mobile for over 6 years. I feel this company made zero effort to keep me as a customer and scammed me out of close to $1000 through making dealing with any customer service a complete nightmare and having website that was only useful if you wished to purchase more products. In addition after I went to paperless billing the transparency of my account became inaccesable.