Parcels lost and no service

I order a lot of stuff from overseas, mostly from China for myself. Since April this year none of my parcels have arrived. I have tracking numbers for most, and the seller has confirmed with the shipping company that it has arrived in South Africa. I have tried phoning Sapo customer services but nobody answers, I have send numerous emails, but only received one back, saying that they are experiencing a backlog and does not know when it will be processed. It has been over 5 months. How long before I can claim from them? Surely after the parcels sits at JIMC and has nbot even been scanned once, we should be able to put in a claim. I have send an email to Mark Barnes, and he does not even have the decency to respond. There are thousands of people feeling the same way I do. How do I find out exactly where my parcel is and when it will be processed. Excuses of backlog and not knowing where parcel is are not acceptable anymore. RG ********** 72CN RM ********** 31CN RH ********** 35CN