My domain got suspended although I paid my invoices
Most probably your domain got suspend because you failed to validate your contact details.
ICANN, the governing body for domain names requires that the contact details for your domains are verified at least once a year. Therefore they sent the validation link to the email listed as the contact email for your domain and require you to click it. This is to make sure your contact is valid.
If you face suspension of your domain already, please check whether you have received an email from DomainValidation.com with the link to approve your contact details. Make sure the email did not land in spam.
You can always contact our Support Team. They will be able to resend the validation link.