Trying to locate international parcel

I have ordered a parcel via Singapore on the 12 Dec 2019 and should be delivered at the South African Post Office, the company advised me my parcel has reached SA and should call the post office customer line to find out at which post office I can collect it from, I called the customer line and have been holding the line for 21 minutes and not once was my call answered, I have been calling now for 3 days different times and the same happens no once answers, I have send a mail to the customer email address and worse not even a mail to advise your email was received and you can expect feedback soon NOTHING so what do I do now, run from pillar to post just to find out where my parcel is?? Really?? Can I please get someone to assist me. This is really unacceptable.