THIS IS A PURE THEFT, BRING BACK MY R70

Someone tell me why i am charged R70 card replacement fee for the your new black card, i went to the bank to update my profile, i was still using the old card, but at some point i was convinced to also change my card, and i was assured that there is no fee, but later i realized that R70 has been charged. This is just wrong, i mean im not the one asked the bank to upgrade/change their cards. What is the purpose of upgrading our cards for a fee?