Bad service and *********** staff

I regret having a contract with Telkom. I took a contract for Data 20G x 2, i was told if i want to make any changes i have 7 days to do that. I have been phoning since Thursday the 28/11/19, no one is able to assist me, if the system is not off they give me a different . As for the staff they need to be taken fro training- bad customer service