Poor Admin Service

I am having a problem that they do not deduct their debit orders and later charge me penalty fees while there was money in my bank account. It happen a couple of times and I even change the deduction date but still persist. I cancelled it on the app but they never responded on my mail. I called and they did not assit but just gave me another number to call and end up being furstrated. I am tired to pay penalty fees for errors not created by. It look like its done deliberately to make extra from me. I wish they can just contact me to cancel the subscription. I mean after I did debi check and they deducted afew months, why stop and charge penalty fees later on?