Excessive requests for pest control

[Zee Ayezain]

Hi BiggerPockets,

i have a tenant that moved in over the summer and have exaggerated and complained about insects (millipedes). We have sent pest control 4 times already and they now request a spraying every 2 weeks. None of the other units in the building complain, when I offered to spray the other units the tenants decline saying it's unnecessary. The building was fully renovated 3 years ago and has been fully occupied since. We don't have any pest issues and the pest company stated to me over the phone that there is no infestation it's just the normal insects here and there. The pest company sprays for free between quarterly sprayings but each quarter it's $100. My cash flow is very low on the property and i watch my costs to the cent. Should i warn the tenants that this is the last free spraying? What course of action should I take? 

Thanks for the help