NON EXISTENT SERVICE FROM SA POST OFFICE

I ordered goods from China and it was dispatched on 04.05.2018 on reference RH ********** 75CN. It is now the 29th June 2018 and still not parcel. Please investigate and let me have my goods

I ordered goods from VENA CAVA in the UK and it was sent via ROYAL MAIL on 04.06.2018 , It still has not arrived in this country. How long do I still have to wait