We were unable to access our domain due to a spam block, even though we never actually spammed anyone. It seems that the host was hacked and a virus infected the system. Once we noticed browser warnings indicating that our site was not secure, we informed our hosting team who managed to resolve the issue. We have now been notified by the registrar company that they have blocked our domain.

To restore the domain, it is not clear who is responsible for fixing the issue. However, we can reach out to our hosting team and registrar company to find out what steps need to be taken. We should avoid putting pressure on anyone, but rather approach the situation with patience and understanding while seeking a resolution.

Taking control of the domain from the registrar company and transferring to a more reliable hosting company may indeed be a good solution. It is important to ensure that all necessary precautions are taken to avoid any future malware attacks or spamming incidents.

Checking the site for viruses and malicious codes, as well as fortifying any potential vulnerabilities, should also be a top priority. Once these steps have been successfully completed, we could approach the issue with the spamhouse and work to clear our name and reputation.

However, it's important to note that we cannot simply lay the blame solely on our old hosting provider without sufficient evidence that they were truly at fault. It's best to approach the situation in a cooperative manner and seek resolution together with all parties involved.

To gain control of your domain, the first step is to determine which registrar it is registered with by checking the domain data in the whois service. Then, you must register with that same registrar using the same data and provide all necessary documents to verify yourself as the real owner.
After that, you should send a letter to the registrar with the domain name and related data, along with your registered account information and request that the domain be transferred to that account.

It's possible that notarized documents may be required for the transfer, but it's best to check with the registrar directly as each one may have different requirements. Once the transfer is complete, you will be able to manage and renew the domain yourself.

If possible, it would be interesting to know what kind of hosting provider you have that blocks websites, although this information should ideally be kept private. It's important to respond promptly to any complaints or warnings from the hosting provider to avoid drastic measures such as a website ban, which typically occurs as a last resort after receiving direct complaints from users and no response from the website owner.