Incorrect credit rating with Vodacom

I have been a customer with Vodacom for the last 23 years, now for the first time in many years I decided to apply for a 4th contract with them, to my surprise I was told that the application is "approved with conditions" I was also informed that my credit rating is very low and therefore I cannot afford the new contract. I immediately obtained my newest credit rating from Transunion and found my score to be almost double of what Vodacom stated it to be! I was treated like a ******** while talking to their online sales dept, I am not happy with the way they are treating a very loyal and good customer. I also opted to send my newest report dated 01/07/20 directly to them whereby they refused to accept and told me that I must sort this out with Transunion, but Transunion says that my credit rating is very high.