Solbank High Charges for small transfer

I hope someone can advise me.

I paid for a villa rental in Spain 998.50 Euros.

I did this by transferring the money from a Euro account with oz-pay (google search for their website) to the local SolBank account belonging to the villa owner (who happens to live in Switzerland).

Oz-pay charged me 1.50 Euros for the transfer, plus an initial £6 to convert Sterling to fund the account.

In the details on their website, Oz-Pay explain that the money is transferred from the partner bank, HSBC in Spain, to the recipients bank in Spain - so it is a local interbank transfer  of Euros (which I take it to mean its a domestic transfer).

I expected that SolBank might charge me up to 0.3%, or in the worst case up to 3% (from what I read on the internet).

However they actually charged 66.50 Euros (6.7%) - according to the villa owner.

Does this seem right?  How might I challenge it?  How can SolBank justify such a charge?  I thought they were supposed to be a good bank for this sort of think?

Please help / advise!

So far I have queried this with the villa owner and suggested that she challenges the charge with her own bank.  if the charge is correct, I wish she had advised me beforehand!