Old tins of Sparberry from 2 different Pick n Pays

Three weeks ago i wrote a complaint in regards to an old can of Sparberry, no one bothered to reply. I emailed you directly.<br> <br> Today, i've just opened a can bought at another store and it's disgusting. Both cans taste sour/bitter. Like the smell/taste of old flat beer (only way i can describe it). This is not acceptable. The tin is not damaged or dirty, just the contents are old and flat<br> <br> When one sends a complain, nothing gets done on your side. It's your product. I took a sip and i feel horribly nauseous. Both Pick n Pay stores say to contact you, but what's the point if no one is going to reply? I cannot keep old tins lying around till someone gets back to me?