Package stuck at JIMC A for a month

I have three international parcels that were received at JIMC Hub on 16, 17 and 19 December 2017. It's been a month and there has not been any movement in tracking information. After phoning customer care, I was informed me that they have a back log and that I must give it a week, well more than a week has passed and nothing has changed. Surely it can not take that long to process and deliver a parcel?! The other international parcels I ordered which were also received at JIMC Hub during that time period has already been delivered to me or has shown some movement in tracking information. Why are some parcels being delivered while others get stuck or never gets delivered!!!