I recommend checking your landing page's code for any suspicious scripts or redirects, and removing them immediately, as well as running a security scan to ensure your site is clean.
in index.php, functions.php, or JS files. Removing the suspicious script may solve the problem.please do you have any tutorial showing how to do this I am not cod on coding thank youIf it is created using a scripting language, then you need to look for obfuscated code in JavaScript, PHP, or elsewhere in the files. Look for window.location or header(Location
If it is WordPress, then check the Theme Editor, Plugin Files, and wp-config.php for suspicious code. Scan with WordFence or Sucuri and remove the malicious script. If necessary, restore the default theme or a clean backup.
Please tell me first about your site development technology. Is it developed in WP or any Framework like laravel?
Instead of trying to 'fix' it, I'd just remove the landing pages completely, try and get your money back from the vendor, and try a different seller/service. If the script is so blatantly redirecting elsewhere, there are probably other 'features' that the authors have included (backdoors etc). Better to just remove it from your servers than trying to clean the code, especially if you're not a coder.
It seems to me by the way that in 99% of cases such services are not aimed at refunding money, given the way the service is structured
