Have used their service for a long time without an...

Have used their service for a long time without any problems as they offer one of the best rates. However recently i've had a very disappointing experience which totally changed my mind about this company and I will think twice before I'll use their services again.
I think it's obvious that customers choose companies like Transferwise for one reason - to save money. And that's where speed and the EXCHANGE RATE counts. So, recently, when I noticed that the GBP-EUR rate was suddenly very favourable i made 3 transfer requests one after another for relatively small sums of money instead of making them one by one as I usually have done in the past (and for sums 10 times and more bigger than these!!!). My money was taken from my account as usual and then i suddenly received an email from "customer service" requiring a bunch of information about my employer, my salary, requesting to upload my payslips etc.
First of all, I believe these requests were totally out of proportion.
Secondly, when I said I was not able to provide the payslips (as I get them electronically) and asked if there was an alternative to this request, I didn't receive any answer even after reminding,
Thirdly, is as I was paying utility bills, because of their freeze I missed the deadline and now will have to pay interest for delay.
And finally, as now they had to cancel those payments and use another service provider - I lost a considerable amount of money because the exchange rate is much worse than 5 days ago when i wanted to transfer my money and no one is going to compensate me that.
I expect the company to comment that they are requested by regulators to require this info etc blah blah blah, but sorry - these requirements need to be 1) within reason 2) AT THE RIGHT TIME - before they accept my transaction or after the current transaction is executed, but not in the middle of a transaction (at least unless it's a really big some of money, which was definitely not my case).
VERY DiSAPPOINTED and vasted way too much of my time on all this