Not Fair, Simply Not Fair

So, I decided to try and register with Teljoy to rent and maybe own a product. All went well, they even have me an istalment limit per month of R1000 All good until I actually chose a product, that when I was declined. I assume because if my fair Credit rating. My question is, why give a monthly instalment limit if you only going to decline me afterwards. You also have no idea if I can afford the instalment or not. You are going on a credit record that shows no instalment missed on anything in the passed 3 years. Yes my score is average but not bad.