WOOLWORTHS LONG LIFE MILK IS GONE OFF

Good Day. Please note that i purchased a 6 pack of long life 1lt milk from woolworths. I already used 2 cartons with no issue. I started using the 3rd carton and upon using it the milk had a slight smell and further more when warming it in the microwave it went funny. The best before/expiry date on the carton is 12/02/2016.<br> <br> Please assist me with regards to this one carton. I have it in the fridge for anyone to come have a look at it