Double charge "authorisation hold"

I am fuming at how unhelpful Uber is.

I am sitting with two double charges and I get sent on a runaround to have my money credited back to my account, I must contact my bank, I do so, then the bank requires a letterhead of the double charges which Uber does NOT provide. A double charge after tipping and a double charge after a cancelled trip.

Authorisation hold should not take so long to return to my bank, it has been going on since last week, they do not refund your money!

You get the same generic response of 3-5 business days, it has been more than that since it was debited off my account.

You will fight aimlessly for your money with no results. Poor service.