well they say "using the exchange rate which prevailed on the date of the original transaction. ", but dont tell you if they are using the SAME exchange rate the operation was done with, or the Exchange rate for that same date but using the "Sell Rate" or the "Buy Rate" they can use the sell rate for the original conversion AUD->GBP that gives them some money, but that same date the "Buy Rate" GBP->AUD is lower, giving them some more money.they are not lying, they used the exchange rate that prevailed in that date, they just used the buy rate first time and the sell rate the second. 😛
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