A company that's unwilling to help

What a horrible experience with their website this week. We have two month-to-momth LTE packages that we can upgrade/downgrade monthly. This entire week we were unable to access our account, then had to change our password as our login details somehow changed on its own. This process took long aswell. When we finally gained access to our account, there was no option to change our packages. Call centre can't help too. Now we are locked into our current packages for the month. Forcing us to pay for top up packages that is insanely expensive. This will be our last month with this company