Bad customer service experienced

I called in on Friday 11/03 at 11h00 regarding my just for u minutes,I bought 180 minutes for 4days on the 09th supposed to expire on the 11th but to my suprise on the 11th after I made few calls I realised that I was billed from my airtime and no minutes available,when I spoke to Andisiwe she said she can't see my history and promised to call me back at 12h00 but she never did. I called again the same day at 14h00, spoke to Violet Moumane and she told me the same thing and promised to call back before 17h00 but she never did. I called again on Saturday, I spoke to Busisiwe for more than 35 minutes and she confirmed that I had minutes and I was billed from my airtime. She said that she is sending my complaint to the back office to refund my airtime as she can't do the refund and I will receive an sms with the reference number and my refund will be available within 24 hours but I never received any sms with the ref number and no refund as yet. I have never experienced such a bad customer service anywhere ever, this is my 2nd contract with vodacom and the last one. I will never ever refer anybody to vodacom or ever take another contract after this one.