International Flight Discount Correction

Ticket logged ********** 697

Due to an error on the system caused by Discovery, points were not awarded to me during December 2018, thus putting me on Bronze in January 2019. I logged a ticket, and the points were subsequently awarded to me, thus pushing me to GOLD. During January, I booked INTERNATIONAL flights, and only received a discount for Bronze. Due to the error on discovery side, I would like to be refunded the portion of my booking as my correct discount level should have been GOLD. I have sent detailed mails to customer service but have received irrational responses asking for information which was already provided. Please escalate this to someone with a detailed knowledge of the travel booking platform, Kulula, BA and Comair, the links between them, and the the discount process.