Why does MyTelus login give me 404 errors?

I attempt to log on to my account and get a 404 page not found error. I have attempted to log on using different browsers (Google Chrome, Microsoft Edge) and get the same error.  I tried to log in from my work computer and get the same error. This has been going on for 4 months now. I call the toll free number, and after waiting for the callback & speaking to someone I get logged in and once I log out, I'm not able to log in again. I'm getting very tired of wasting time calling Telus whenever I want to print my bill. I'm not impressed and the people I speak with don't seem to be able to fix the issue or explain why this keeps happening.