MTN DATA SIM

In Sept 2022 my contract was expiring, and one of the MTN officials called me to offer me 300GB for R300. To my surprise I only received 100GB and I have been calling and sending emails. There is no feedback and they promised to listen to the recording up until today they are still looking for it. This is annoying and I'm so irritated by MTN AND I have been asking them to cancel my contract cause I can't be paying much and receiving something that won't even list me. This is irritating and I feel like MTN has decived me and also they don't have respect. I'm tired to respect my story on emails and calls. This is annoying to the highest level. Can they end my contract and give me back my money