They gave me a TC Diners with a quota of $ 5500, I...

They gave me a TC Diners with a quota of $ 5500, I started to use it all very well but until I wanted to buy equipment for my work abroad for $ 4200 they informed me that I cannot buy for that amount since it is not authorized, so why Heck they give you that quota if you can't use it, the very despotic lady told me if it doesn't serve her closure and I'm working on that