Toricredits come instantly over online payment. 1000 TC = 1$, so you would have to pay 100$ to get 100,000 TC. Also you can only buy them in bundles of 10K for ten bucks, 4k for four bucks.
So there are two possible explanations. Either you're lying, or i lied about the number of explanations. No way you can get 100000 toricredits for 50$. Nor can you buy it in one bundle. Purchase information, e-mail used, credit card used, etc?