Disgusted by the company's service!!!!

Good day, well there is nothing good about this day! I am so disgusted by the service I have gotten from this company so far, I usually ship parcels with 'Buffalo Logistics' from China which I still do, when parcels get to RSA they get handed over to local courier companies. At first, they were using 'Fast Ways' it was the best so far and no that they are using this disgusting company my parcels are getting lost in transit. At first, it was a Cellphones, I have been trying to call the company for the past week, all they say is they will get back to me. We try to call at least 3 times a day, but we have still received no feedback from them. Yet the parcel on the tracking system shows as received by the client. I have just tracked another parcel now, it shows that the client has received the parcel and yet there was nothing received at all. When we try to call them today they are just dropping calls on us. I am so disgusted and extremely annoyed by their service and at this stage, it is ruining my business as I am not able to deliver to my customers. I want my parcels back, after this, I will report directly to 'Buffallo Logistics' which I have been using for over 2 years with no complaints!