Website not working the way it is advertised.

I have tried today again to upgrade online. No luck, you get to where you need to enter your postal code, then it does not allow you to enter it and that is where it stops every time. Then phoned the helpline and insist that I want to upgrade online. Then being told that "there is a problem with our website. Since 15 June when I tried the first time? It is quite ridiculous to be told by by a high tech company like Vodacom that a service that they offer have been faulty for two months already? Bad service I would say. I will need to change my service provider? Vodacom unfortunately won't care..................