been getting text messages and missed calls from a person named deborah claiming to be from smoke alarms to arrange appointment ,i rang smoke alarms about this and they didnt know about the calls .warning to others that this is a scam to get into your property

Menulog Order confirmed by Rio Grande Kensington. Expected Delivery time is 18:03. Call (02) 9662 7755 if any issues. DO NOT REPLY.

This number sent me a spam text message to the data only sim on my tablet. Obviously being data only it has no phone listing and the sim has never been used for anything but mobile data. It is only two weeks old. So where did they get my service number??