EDS APPALLING SERVICE

I am just from Ed's Express Groenkloof Campus and the service was appalling, I bought a medium milkshake and I got served a small milkshake in a coffee cup. Upon my complaint the manager yelled Goodbye as I left the store because his attempt in exploiting me as a student was unsuccessful . I then asked for a return on the meal I had ordered entirely because I lost my appetite because of how incredibly rude the employees of that franchise was. The absolute worst service. Very Appalling.