So after amazing help by @Afrigirl and Sophie from Vumatel we got to the bottom of the problem which I am summarising here to help anyone who runs into this in future.
When Afrihost posted the router, it had default wifi settings, as outlined on the router label underneath. I used these to set...
Don't know who the previous ISP was annoyingly as lack of comms with previous tenant and Afrihost would not say. i did a reverse DNS on the IP (152.110.139.1) while there and it showed up as Webafrica/Dimension Data Ltd?
Apologies if I am not completely familiar with all the jargon, or if this is old territory (I have browsed and searched): I'm actually based in the UK.
BACKGROUND: In November my sisters and I inherited my late mom's little cottage in Cape Town which has previously been rented out long term...