It is preferable to use matched RAM when updating. The 3200 RAM would clock down to 2133 and may cause compatibility problems. The best solution is to order a 16GB kit and Crucial RAM is the most compatible with Dell systems. You can find that RAM here on their European site and they do ship to South Africa.
I haven't been using my Inspiron 5567 much, but will be in the very near future. I want to upgrade the RAM and I will also be installing a 1GB SSD at the same time. Currently I have 8GB of RAM and I think I can add another 8GB of RAM as there is a 2nd slot  Do Dell laptops only use Crucial RAM ? I am struggling to find Crucial 8GB DDR4 2400 Sodimm in South Africa, only 3200 Mhz. Will it caus[IMAGE][IMAGE]e a problem if I use this with the exisiting RAM?  
RAM for Inspiron 5567