ADT worst customer service in South Africa

If I could give 0 or minus i would. This company has the worst customer service in South Africa. I cancelled my contract on the 15th of June 2023 and the radio was removed on the 23 June 2023. I was willing to pay for the additional 15 days in July even though I received no service. ADT has the audacity to charge me for the full month. I have called their customer service centre to speak to their accounts department numerous times, July, August, September, October. They are always busy, and a supervisor will get back - they never do. Now they have the audacity to hand the account over to a Legal firm for collection. Someone better get back to me ASAP it's not the amount but a matter of principle. If my credit record is affected by this there will be trouble.