Contract revocation status

I had sent the email to "https://mailto:widerruf@cc.o2online.de" on 2nd June for revoking my contract, but still have not received any communication from them. I am trying to contact customer care on phone but are not able to. I just want to know whether my contract is cancelled or not?

Please note that I had sent the email for cancellation witin 14 days of conclusion of the contract and had applied online for the connection.