Create an investor list who have a history of investing in similar lines. It may lead to deep research. Reach out to them via mails/calls for an introductory call. I am sure someone might be interested in your product but patience is the key.
I helped a similar client in the past with some back ground research. If interested, I can help you too..
Good luck.

Go to thisweekinstartups.com and watch the videos. Listen to the interviews.

Go to http://thisweekinstartups.com/startup-basics/

Click 'Load More' and listen to How To Raise Money From Angel Investors.

Where are you located?

Finding investors is all about networking and relationship building.

I'd be happy to help point you in the right direction.

I'd start with Angel List. I'm not sure if there is a comparable sight in Africa. This link may help.

https://angel.co/africa/investors

It shows a list of investors that live out there and others that are interested in the market. You can drill down farther from there.

Let me know if you need help talking through the process of reaching out to them.

If you've created a "perfect pitch" you should not be having any problems.
Have you tried crowdfunding platforms like "Kickstarter"? If your pitch is so good, you will attract a lot of smaller investors... and maybe even land a big fish or two.
SEND ME YOUR PITCH... and I will see if it is as good as you think!