Call centre agents are *****

This morning I recharged with R29 airtime and my new balance was R37 only to dissappear without making any call, I decided to call vodacom customer care one of the agents said she will call me back after 15 minutes but she did not call, I then decided call again after a hour the second agent told me the same story I will call you back in 15 mins the system has not updated I waited the whole day no call from either agent..... So here I am vodacom took my R37 airtime and kept me waiting the whole day