No follow through or keeping of promises

As a follow on from my complain on 15:44 Tue 3 Nov. I was at braai on the 20th of Dec and we were discussing what happened with a friend who pointed out to me that now that I have the Sony Xperia Z5 I should be paying less for the phone and should query this as I was still paying for the Samsung Edge S6. I logged a call on the 20th of Dec and then again on the 30th of Dec as I had no feedback as promised. The SR Reference Numbers are as follows A1-XF91-DAM1M1 and A1-XFEZ-7IP14X respectively, in both instances I was promised 48 hr turn around time. I then followed up again on the 7th of Jan and was told they tried and could not get hold of me after I had given them my email address, a 2nd contact number too. The SMS received from Vodacom says they would make contact via SMS email and phone yet I did not get anything. After complaining the 3rd time on the 7th of Jan I received an email with the following SR Reference A2-1I84-L4CUT SM-G925FZDAXFV SAMSUNG -***? and I am still waiting.<br> <br> Please advise what one needs to do to get good service in this day and age, right now Vodacom you are seriously trying my tolerance!!! <br>