Hey, Im have a fail with a product of mineplex, Help me please!

Hello, I had an error when buying the product rank of knight (from mineplex)
And it is a range of the Mineplex server, here they have what happened:
I was buying it, I had already selected the payment method: Balance of the Microsoft account and just at the end said:

Something went wrong ---------------------------

We could not...

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I detected the balance as 5.2, which I think is good, but I detected the product as purchased (error in microsoft, not in minecraft) and I would like to be able to buy since they bother these errors and are small and I do not know what else to do say it, I hope it can be solved and

Thanks for watching.