Non-existent service from Pick n Pay

Disgraceful service from Pick n Pay ! Made an online purchase a year and a half ago - incorrect goods supp****. Never received any response until yesterday - received an email to the effect that "service call ******xx has been completed" - but NOTHING has been done. Could not respond to the e-mail directly, sent from a no-reply email address. Looked up customer service email on Pick n Pay website, and sent an email. Returned as "undeliverable - mailbox full". Seems there are a lot of customers complaining ! Tried phoning the call centre this morning - extremely rude and unhelpful agent raised her voice at me when I complained about the bad service, and then cut the call. How can you treat customers so badly Pick n Pay ?????