Upward migration

I upward migrated from LTE 10 to LTE 50GB. I wasn't informed that I would incur additional fees and the Ts&Cs from Telkom confirm - \The subscriber may upward migrate without any penalties at any time during the fixed term agreement."(copy and paste of their Mobile Ts&Cs) AND \""2. The subscriber may upward migrate without any penalties at any time during the fixed term agreement subjected to the differences in the base subscription\""(copy and paste of their LTE Ts&Cs) . Yet"