Poor service 3 month old Account/service query

I have a contract phone *** which my son uses. He bought 4 gig data on the *111* menu that expires in 30 days and its re-occurring. This was a mistake on his behalf. I called Vodacom to please ask them to stop the re-occurrence going forward. They said they did. I should get R110 airtime per month on this phone. its 3 months later and they still take R99 airtime and give me 4 gig data that expires in 30 days every month and I have uncapped wifi at home. Call Centre raised a service request S3-8GB3U-U7 and said back office must fix this. they can only update the service request they can not talk to them and i cannot call. i should get a call in 24 hours. Just logged a call again, call centre put me on hold for 5 min and without saying anything put me through to contract retentions. Nadia listened to my complaint but said she could not help she can only update the ticket and I must call Customer care centre again. She asked me politely to be patient.....yeah right a simple query 3 months later and I must be patient...I am only human and very frustrated with the poor service. I have 3 contract phones with Vodacom which I will NOT renew. My query remains unattended