Bad Service !!

Please can someone assist me with a query that i have below

On the 11the of September, i called customer care to ask if i can migrate my current LTE services to fiber and was told "yes" by the agent and was transferred to the fiber department, i then asked the sales lady Nosipho if it is possible for them to migrate my LET to fiber and she advised that i will have to take the fiber contract and it needs to be active before she can stop the LET services ( chats below ) now when the fiber is active , i have been advised the i will have to pay a cancellation fee of 14k to cancel the LTE ...i then requested that the fiber line to be stopped and was advised that i will have to pay 21K ...how is this possible?

If i was advisedof this in the beginning i would not have taken the fiber line

Please can someone assist me and advise on a way forward