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@jvk: Which app are you using to access your emails? Also, for clarity, are you marking the messages as spam, but the messages are not being moved to your junk/spam folder, or are they moving as expected, but re-appearing in your inbox?
To troubleshoot the issue, after marking the messages as spam, open your junk/spam folder and delete the contents immediately. Alternatively, it may be the case that you are receiving duplicate spam messages, rather than previously marked messages moving back into your inbox. With this in mind, make a note of the senders address, and check it against any new messages that arrive in your inbox. You should also reach out to your email provider directly to see if any steps can be taken to reduce the amount of spam you receive.