My most recent purchase was also a cable Ratel to CPE and I had exceptional service from Afzahl Kahn who treated me as if I'd spent thousands of dolla even though it was only a few hundred rand.
Last order I paid on a Wednesday afternoon, parcel arrived Thursday morning.
I believe R S Components also sell cables but I've never dealt with them so can't comment on their service.
P.S. Are both your router and ONT 9v? My router is 9v and CPE is 12v so I needed 2 separate cables.
The knowledgeable guys here helped me a lot with connecting the Ratel.