Disappointed contracts and services from MTN

I am a MTN client since the 1990's. Not sure on which date did I get my first cellphone contract with MTN. My last upgrade was done on 16 June 2019. I am very disappointed with their new Made for Me contracts. This is very expensive and little airtime and data. And I also took a Bonus Air time bundle to top up my airtime for which I pay every month extra on my contract but did not received even one minute from that extra bonus bundle. I've went to MTN Riverside Boulevard to query it and a few days after the query was locked received a sms that query is resolved without the extra airtime MTN owe me. I must buy extra prepaid airtime out of my pocket to top up my airtime while they owe me over 100 airtime minuntes. That is not fair.