Overcharging for landlords and Citiq app that doesn't log in

Yesterday my tenants recharged their prepaid electricity now the problem is that why my units going fast compare to before , I don’t cook everyday but the way they it’s are moving fast it’s so frustrating. Another thing I can’t log in on the app but on the browser I can n I have sent emails but no respond . Then how can I check how come my bill is so high like this and I never spend more than what I’m buying for electricity now . Really it’s insane n it’s very costly on the landlord side. Really I’m frustrated