Vodacom Customer Service is terrible

I had an OBF with my Sony Xperia Z3. I understand, this happens, its a Sony manufacturing fault. I cannot understand why it takes so long for Vodacom to give me back my phone. They said it would take 7-14 working days. I got a new phone a MONTH (!?) after sending it in and only because I called them to find out what was happening. They said they did not have stock of the phone, but didn't inform me of this, suspiciously they had stock the day after I called them. So I finally got my phone albeit horrible customer service and terrible attitudes from EVERYONE at the store. And then a month later the back of my phone cracks without being dropped. Again, this is said to be a Sony problem (which is another report I need to write), not a Vodacom problem which I understand. But now I am currently waiting for a phone I sent on the 3rd of March 2015,8 working days ago. I received a message on Monday 9th of March to say that it is at advanced repair but haven't heard from them since then. I called to ask what is happening and they said they cannot tell me where it is and i should wait for an SMS. Repairing something that's not my fault is a Herculean task,working with Vodacom is impossible!