Is there no one to answer?

The domain purchase attempts were not being declined by your bank. Our payment processor's fraud protection flagged your card after the rapid succession of purchase attempts and blocked further charges. The block on our side has been cleared, so you can go ahead and try the domain purchase again.

Thank you. Can VAT invoices be issued for these?

You can add your Tax ID and company details on your workspace billing page, and they will appear on all future invoices. For existing invoices, you can re-issue them with the updated details using the gear menu next to each invoice in your Billing History - the re-issued copy will reflect your current billing information. Full steps are in our docs.

It seems like this issue has come up again with my account. Could you offer some advice?

Card declined

These new declines are coming from your bank, not from our side. The earlier block from our payment processor has already been cleared (and several domain purchases went through successfully after that). Your bank is now declining the charges with a "do not honor" response, so please try a different payment method or contact your issuing bank to authorize the transactions.