yesterday
yesterday - last edited yesterday
There's no €10 plan so I presume that you're referring to this promotional offer for a €3 discount on the €12.99 membership plan for 6 months?
If you meet the qualification criteria for the offer then you should get it automatically.
In particular, note the requirement that you keep membership plan auto-renewal enabled.
What exactly is the text of the email that you received?
If you are still confused then you might want to contact 48 support for clarification.
See the links in my signature below.