Wirex isn't a scam (well, it wasn't before -> i was all happy before on the e-coin platform), but they have a lot of problems lately..
Exchange rate is really too high, should be less for about 3-4%.
I sent over some BTC last night and it shows the transaction went ok , but the BTC never arrived on my account.

Im sure they will fix this issue of vanishing BTC, because on the block explorer i can see that the amount is there.
But for the exchange rate... I believe nothing will change