Bad Customer Care

Did an upgrade online. Got a phone call from call centre to auth the upgrade. Then I got the random 5 computer generated questions, only Yes or No answers. One of the questions they asked about previous employer, but left out one letter of the name, therefore I said no. Failed auth. Then second set of questions. Did you once have a office nr of ******x. Seriously, I've been a client of vodacom since 1999, I can not remember all the office number from previous work places so long ago, and it is not on my phone anymore? Fail 2nd auth. Now they have blocked my upgrade?? I have to go instore to do upgrade. Now the stores says they can not help it is a ONLINE deal? What should I do? This unacceptable. Do you not want my business? Think logically about it. I logged in on app (my password), did the upgrade. Then the call centre phone me 3 personal questions, I answered all of them, then 5 random computer generated questions???? and if they deliver your phone it has to be you to accept it, and have your id available?? More auths done? I am so upset, can not put in words...