Incorrect order delivered

I purchased a case of 1L Johnie Walker online and paid for the delivery charge. They delivered a case of 750ml instead. I called the online customer care center every day for 4 days and not one person has gotten back to me to rectify the situation. The only manager I managed to get through to was Anthony from the call centre. He promised to get back to me before lunch that day but I never heard from him. Makro has a very clear returns policy that addresses this issue and yet I couldn't get ANYONE to commit to this policy. It states clearly that the incorrect item will be uplifted and the correct one delivered. It is absolutely frustrating dealing with Makro and I will escalate this further through legal channels should this not be addressed.