Bad service

We were told that we need to migrate to MTN as cellc will no longer give out the 100GB of data. I did that on the 13th of November 2019. On the 1st of December 2018 I received 20GB of data which was said its free. I refused to pay my account as the service was bad. A lady by the name Matshepo said I must pay off my account then they will top me up as I complained to her saying the 20GB is finished and I'm expected to buy data from my pocket as they only gave me 20GB. This morning I paid my account and a lady by the name Jessica asked me if they can top up my account but I will be charged. I asked her why should I be charged again when I paid for 100GB but I never received it? She had been mute since.