after complaint no action

I had purchased a 6 pack montic long life milk from a store in lenasia. It was bad and definately not worth my while to drive all the way back to change. A few days later upon visiting the same store I had again purchased another 6 pack long life montic milk. And AGAIN it was bad. I had contacted montic directly. The very next day I was given a call by a lady named Juliana. She had requested some info from the packaging etc and after supplying this info, she had stated that she has forwarded my details to the relevant department for replacement purposes. Since which is almost 2 weeks later, there had been no replacement of the milk, no contact nothing. I just find it strange that even after receiving a complaint, they're still not on top of their game! Makes one wonder about the quality of the product too....