Very Disappointed with Customer Care and Service

I renewed my contract with MTN for a further 2 years on the 9 July this year. Every month since then they are are only laoding half the minutes and data that was agreed on the contract renewal. I have phoned on numerous occasions and even been into a store. I still have not been assisted. I spent over 35 minutes on hold for MTN South Africa customer care and retention's and eventually had to give up. loading the issue on the my MTN App also doesn't help. This is very dissapointing, I have been with MTN for over 15 years and yet when I need assistance it just does not happen. Very quick to resell something and very good running their debit orders, but extremely slack and disappointing when you need help. This is really upsetting and obviously customer service does not exist.