Who to contact again??

I have app**** and been approved for dstv pricelock in March 2019. This was with delivery and installation. I have tried numerous times to contact the dstv call center as well as the courier company to get feedback regarding my delivery. as a result I have found that my dstv decoder has been signed for by an employee. they still haven't called me back with a new parcel number or even to confirm a new delivery. Speechless how this can happen