Upgrade of contract

I am currently trying to do an upgrade on my phone. I received the worst services I could ever imagine: 1. It is taking 3 months to do the upgrade and it is still not working (sim swap is done but my new phone is not working with the nano sim) 2. The bill is currently a total mess - where payments are made my account is being increased! 3. I need to wait for two months to get the number transferred because of a new system and old system. 4. When I phone in to find out what is happening - I got the answer - we will phone you back...still waiting!!! Too busy for client. And I made a few calls! 5. Upgrade was done then the sales person can't say they don't have stock. I am very disappointed in the service!