Upgrade gone wrong

Vodacom nags you so much for you to upgrade, a call least 3times a week if they can't reach you, I finally decided to renew my contract in early Jan 16 at first I was impressed I got the phone 3days later but only to find that they sent me the correct devices with incorrect internal memory, instead of the phone's having 8G each one had 4 n the other 2, vodacom power tab 10 and vodacom smart 3G. i enquired with the sales department thinking i misunderstood the specifications but several people confirmed I was right. They took the phone's back after a week then reordered which took three weeks because they were out of stock of which I understood, surprise surprise they send me the exact phone's again. I called again to complain was placed on hold for over 30mins, Maria the supervisor promised to call the next day but didn't, when I called apparently she knocked off. I have two contracts with vodacom, is this good service?