Conta desactivada

Hi,
in February I received this message on two numbers, even if my id cards were confirmed when i first did the contract in Saldanha store.

"O seu tarifario foi alterado p/ Tudo 1GB. Garanta no dia 02 um saldo minimo de 13.99EUR p/renovacao dos beneficios do seu novo tarifario"

This caused me to double pay the bill for one month on two numbers: (935 - WTF)

606090, 16,80€, paid on 02/02, expired 09/02
594328, 11,80€, paid on 18/02, expired 25/02

How can I proceed to have my money back?

Sorry for using English, my Portuguese is still not good :)
Thanks for your help!
Andrea