Same here.
I had ordered a module for bankwire from the mypresta.eu website.
I never received an order confirmation or invoice. The module could be downloaded once directly after Paypal-Payment.
Unfortunately it did not fullfil all the requirements I needed.
I contacted mypresta/Vekia through the adress provided by Paypal and received a very detailed and kind answer.
I was offered a refund and instructed to uninstall the module and delete the installation file.
Unfortunately after doing as instructed I never received a response or refund.
Status quo: money for nothing... no module, no invoice, no order number, no response from the support...