Meat was rotten before expiry date 2 days in a row

On Friday 15th I went and bought 3 packs of Boerewors after going home and putting it on to fry it has an awful smell which meant it was off. I had to go back and return it the expiry date read the 17th January 2016. The next day saturday 16th Jan I went and did my shopping and bought pork rashers expiry date 18th January after going home and putting it on to fry again this meat was rotten and i had to go back and return it. I spoke to the manager who said she would speak to the butcher. This is absolutely ridiculous that expired meat is being sold and I would like to know if I should never be buying any meat at checkers.