Been charged for 2 contracts when I was told I will be migrated and be paying for one contract

I received an email telling me to migrate my broadband 20 GB LTE to DSL uncapped, which I responded to. A consultant called me and I asked him is this going to be a new line or is this going to be a migration. He responded this will be a migration and we will waver your broadband contract which mean you don't have to pay for the broadband anymore, so I agreed to that but when i received my bill, I was billed for the broadband 20Gb plus the DSL. I've been trying to contact telkom from the 20th of July till present and each time I've been told this is the wrong department contact Sales then contact accounts then contact telkom mobile and customer service. This is very frustrating as no one seems to be able to help me and I received my bill for end of August for both contracts even though I am not using the broadband data