Online app Plain sundae ****

I purchased a R15 plain sundae on the McDonald's app and in the picture, it shows a full cup of ice cream however once I got the ice cream it was barely full, and instead of telling me before hand it was that it was a mini plain sundae, which the app did not state at all, I already got a half empty cup, and told me it's my fault, it's pathetic and unprofessional, I wouldn't recommend anybody buying it.