Unauthorised debit and bad service

Adt attempted to deduct a payment of my account out of the blue on the 8th of Jan 2021, of which they have my deduct date of being much later in the month. On top of that I was not consulted that this amount would be deducted from me. I contacted them the same day and the consulted even confirmed the date they have o their side - she also could not advise why they attempted to do so. She advised she would escalate my query as urgent and someone would contact me. No one contacted me - today I get a threatening message to pay to avoid suspension of service. Reading other people's comments, is clear that this kind of service is a norm. Disappointed