Poor Management

Hello,i was previously subscribed with SOS PROTEC for many years, last year i have found another affordable security company. As per the agreement if one cancel 1 month notice must be filed i did so in JAN 23rd 2020 of which my notice was from 1FEB 2020-FEB 29 2020,and the debit went through on the 1st of March of which assume was still correct according to how they calculate the month instalments.

The issue comes this morning when i received a call from SOS and telling me i owe them the month of April 2020, i failed to understand this whole issue and i called them and chat with the person in accounts and i have told her that i will send my proof of email that was sent in JAN 2020,and so amazing they even contacted my husband about the cancelation on the same day i sent the mail through but they were claiming that they didn't see my initial mail ,now the question is how did they learn about the cancellation? if they called on the same day i sent an email? At some point few months after they collected the radio I recieved a call from the company saying there is a false alarm in my premises ,how is it possible if there no radio activated from their company? and also my husband received a call saying the same thing. I felt so humiliated. Not sure what game are they playing here!