Authothirized pre authorization

So only saw this morn that I had a pre authorization debit for r491. 41 that I have no knowledge of reference number is tele training. Com *** and the person I spoke to couldn't even give me a name of that company or whatever it is, my son is in hospital and I need to use that money, I don't know who these ppl are I'm so dissatisfied it's not funny I want my money back into my account then I'm changing banks, this is the nonsense I will not tolerate, worst is they have to stop my card and me again have to pay for another card, hai