Vodacom incompetance

For 4 months now, vodacom insurance has been unable to rectify a mistake they made on my account. They have admitted it, but still have not credited me for adding comprehensive insurance incorrectly. Eveeytime I report them to Hello Peter ( this is the third time) I get a call back the next say from vodacom making promises that they are in the process of fixing it and will keep in contact and will let me know, only not to hear from them again. Because of there mistake my service on vodacom is limited which has an impact on me being able to do my work or having contact with my family.