bad service and stale products

bought cashew nuts which was a mess. i contacted customer care and they took about 2 weeks to get back to me and then issued a voucher. went back and got peanuts with the voucher and this time it was stale. emailed customer care again and they took even longer to get back to me and then notifies me that their technologist advised the nuts are fine yet they dint even pick the nuts up. i asked to be contacted by a manager and to date no one has called. sent my brother to Woolworths to buy the 3rd packet of nuts and we are told he is not allowed to cash the voucher because i am not present. all this time and money wasted on going back and forth to Woolworths yet they don't even respond timeously to concerns. they quality has seriously dropped and standards are definitely not up to expectations. i am seriously considering changing brands after this awful customer experience. to think i have to put woolies on hello peter just to get someone to contact me