Telkom S8 and wireless charger ****

I took out a contract for a Samsung S8 and wireless charger in December 2017. Telkom wants to replace the wireless charger with a power bank which I find unacceptable. I have a contract for a S8 and wireless charger. I have been to the Fourways Crossing store numerous times and they are of no assistance. I have contacted Telkom via their Facebook page and have left my details and their response was that they will get back to me. I have received no other communication from Telkom. I have tried various channels of communication to try and solve the problem and they all direct me to going back to the Fourways crossing store , where the managers has told me that there is nothing that he can do for me. He informed me that i should accept the powerbank or accept nothing .