Keep a reference
Record the call date and any reference you were given, along with your heater model and location. Quote those details when following up.
Changing arrangements
Contact the number used to arrange your request and confirm any replacement appointment directly. Browsing the website does not change an existing booking.
If an issue continues
Describe the current symptom and whether it differs from the original problem. Mention the service date and any work documented.
Agree the next step
Clarify the follow-up action and retain the service paperwork. Do not dismantle the appliance to investigate the issue yourself.