They’re not supposed to call the police when they’ve been robbed? Theft of service is a crime is it not? If the police aren’t doing anything that’s the problem

I'm speculating here, but I guess it boils down to the amount of money involved combined with the absence of threats or violence.

In general it makes little sense to spend resources investigating a non-indictable offense where the perpetrator is unlikely to be found in the first place and even if they are found the cost of even finding and processing then is much higher than the monetary damage they caused.