Off meat

We bought meat on the 24th of september 2017.

X2 Pork steak rib eye .

We freezed it and when we wanted to cook it on the 29 September 2017 was off completely . One sell by date was 25-09-2017 And the other was 27-09-2017.

On that same day we bought a roast pork belly that we had same problem . And sell by date is 25-09-2017.

It has happened on numourus occassions and now i feel like i am wasting money.