Wrongly transferred airtime to a number that doesn't work, now they won't help

On the 10th of May , I bought airtime for my cell number ********** 481, I transferred airtime to a wrong number which is not working( ********** 700), unfortunately I wanted to transfer to ********** 700. I then called the number but it goes straight to voicemail. I then had to call telkom' calls centre. The agent that I spoke to said they were gonna start dealing with my issue only on the following Monday since it was a Friday , which I understood. A week later, I called again since the matter was not resolved and I had not heard anything from them, the agent said to me, there is no help that they can give because the number belongs to another person. My question was, the number dose not go through, so how was I supposed to call that person so that they could transfer back my airtime. I made mistake by punching just a wrong digit , how many people are making the same mistake , and what happens to that airtime , since the transferred to a number that doesn't even go through. The answer was, unfortunately you have lost, you have to move on. I then asked , when was the number last active online, the answer was , we cannot verify that, so I then asked , how do you know the number is active, when you don't even know when it was working. Honestly, the Giants are taking advantage of the weak, anybody can make a mistake at some point in life, should you be punished for making an honest mistake, especially when it involves money, and quite frankly from a well known and established service provider like Telkom