From an ad for financial services:
"Lock in your appointment now to insure these special rates"
The word "insure" is usually used to refer to insurance:
I would like to insure my car, please.
When you're saying that you want to be sure about something, you use "ensure":
Please ensure you lock the door before you leave.
Now, if you use "ensure" instead of "insure" in the criminal sentence, it still sounds odd, so let's improve it:
Lock in your appointment now to ensure you receive these special rates.
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