non receipt of credit as advertised

I received an SMS from Vodacom which read that I would receive a R20 bonus in my M-Pesa account if I recharge using a voucher. On 2 October I recharged My M-Pesa account and should have received my bonus R20 a week later on the 9th. I did not receive this bonus and decided to query it. <br> On 13 Oct I called the M-Pesa line *** to query the credit. I was told that a service request call was logged with the IT dept and that I would be contacted withing 2 working days, ref S3-9JT22-2FE7U. On 16 Oct i called the M-Pesa line again because I had still not received a response and was told I would get a response later in the day. I called again at about 3:15 pm on the same day and was promised that an IT consultant would call me back before 5:30 pm. It is 3 days later and I am yet to get any feedback.