Taking money without warning - very poor service

We had been clients of Vox for a few years before we moved house in January of this year and decided to sign with a different provider. We gave notice in January and had a very smooth cancelation process. A few week after we moved we received a call on the intercom of our old house (it had not been sold yet so we were still registered on the intercom) from a courier guy saying he was there to collect the equipment. We had no idea what he was referring to. No one had communicated anything with us and we didn't even know what company he was collecting for. Since we no longer resided there we said to him we have no idea what is going on and are not there so he left. A few months later we receive an email from Vox saying we owe them close to R3000 for equipment not returned. We contacted them immediately saying we had no idea we had to return the equipment and we have no problem returning it, could they possibly send a courier to our new address to collect. After being on hold with the logistics department for ages we eventually got cut off. We called again and asked if someone could phone us back. No one ever called and we eventually left the matter as we felt we had already gone out of our way to contact Vox as there was no communication from their side. Another few weeks later (last night) we notice Vox had proceeded to debit our bank account with the amount they mentioned. This is absolutely unacceptable. We received no communication regarding the matter from Vox prior to them saying we owe them money. We tried to contact them to resolve the matter and have been very willing to give back their equipment. How is it that they never returned our phone call but now have the audacity to just debit our account as they feel fit? They did not even send another email saying final warning. Their communication s****s are atrocious and if this is the way they treat loyal customers we are shocked. We even consider signing up again with them a while back but there is no chance this will ever happen. We will also warn anyone wanting to sign with them about their service.