Hi i am from nepal

A Person asked me for around 2600$ to change business visa in bangkok , i sent those amount from nepal too . After few months he again demand for 3000$ & told which was necessary for changing visa as his company's manager post. And i refused to go there and asked him to return those amount 2600$, he told me due to my reason he beared losses and paid fine thats the reason i cant get my money return back. Is it true? But he hasn't sent me any evidence. Please help. That person is also a Nepali.

Please i like to know which is easier, non b visa to non O or tourist to non O?