Blocking and reporting are separate choices. One concerns the contact you want to receive; the other asks a service to consider conduct. Before using either, read the service's current description so you know what it says the action does. Do not assume that every dating platform handles accounts or evidence in the same way.
Start with the outcome you need
If you simply do not want to continue a conversation, you can choose to stop contact without claiming a rule was broken. If there are messages or actions you want reviewed, identify those specifically. A refusal to date you is not a reason to manufacture a complaint.
For an actual incident, use plain language: “This account sent these messages after I asked for contact to stop.” Separate what you observed from what you suspect. You do not need to diagnose the sender or explain their identity to describe the conduct.
Keep relevant information before changing access
Check whether the service explains what happens to the conversation when you block or remove a connection. If you need details for a report, retain only what is relevant where you can do so appropriately. Do not share the material publicly merely to prove that you have it.
Record the account identifier, date and specific content at issue. Avoid including unrelated private messages, photographs or someone else's information unless they are necessary to explain the report. More material is not automatically a clearer account.
Use official reporting paths
Find the reporting option through the service's own interface or help information, not a link sent by the account involved. Follow the requested categories without inventing details to fit a more serious label. If no category fits exactly, describe the incident in the available space.
Keep any confirmation or reference number provided. A submitted report does not establish that the service has accepted your interpretation or decided on an action. Do not promise another person an immediate removal or a particular result.
Understand the limits of a block
A block on one account is not a universal barrier across every service, device or anonymous public page. Review any information you continue to make public. Do not test whether a person can reach you by repeatedly reopening contact.
If there are threats or immediate danger, an application report is not a substitute for urgent local assistance. For ordinary unwanted contact, you can use the available controls and decide not to keep debating the interaction. Blocking does not require the other person's approval, and reporting should remain an accurate account rather than a form of retaliation.
Further reading
eSafety Commissioner: online dating. These examples are editorial; consult the actual service for feature behaviour and response procedures.