Hi Hansi 👋 welcome back to the community, thank you for posting!
Sorry to hear about these issues with your SIM. It can take 24 hours for a SIM to activate. Please let us know if the SIM is not working later day after 24 hours since the activation! Thank you for your patience in the meantime! 🌞
Regarding the credit, if there were not any days without a total loss of service sadly you would not be entitled to any loss of service credit.
Please keep us updated on the SIM's so we can send you a PM to confirm a few account details and offer further support if needed.
Wishing you all the best!
Molly