Still waiting for the refund that was promised to me

I am a Vodacom FTTH client and in February I had a two week service outage. Vodacom did not communicate with me at all, despite each person telling me that they would call me back with an update by the end of the day. Each day I had to phone and speak to a new person to tell my story all over again. Eventually my service was restored and I was promised a refund for the two weeks that I had no service for. I have followed up numerous times and nobody has gotten back to me about my refund and nobody is replying to my emails. And of course, no refund is reflecting on my statements.