VODACOM

I did an upgrade with vodacom and I wasn't happy with the device so I requested for it to be returned, the device was picked up by ram couriers. I have spoken to numerous call centre agents whom where of no help.. i was advised that once my device is received (device was received before end of July )it will be processed and I would be able to upgrade again. I called in again and i was advised by a lady that I will be eligible for an upgrade on the 1st of August its been over a month and I still haven't gotten any response everytime I call agents advise and promise to call me back but nothing has been done.. when I call again today they say I can only upgrade on the September 1st when this is going on for almost a month. I am very unhappy with Vodacom's service this is the first time I have experienced this and I am very disappointed!! With the lack of knowledge by the call centre agents whom give me different answers and dont understand how to explain processes ! When I try to call now my call is not allowed to be transferred to a call centre agent!