Cannot upgrade products online

Been trying to upgrade my VoIP account online (PC, Chrome browser) since last week. After checkout it asks for my address, but won't let me enter a street name which is a required field. I logged a query (MWB***7) 3 days ago but to my knowledge it has not been attended to. Did get missed calls from the sales number but was not able to get to the phone in time. Still cannot complete the upgrade online as of this morning.

When I called ***, after going through the whole rigmarole of entering ID number and one time Pin twice, I was cut off each time.