Customer service at Hi Tech Security- Deplorable

Usually when you leave a service provider to join another you would think you part ways amicably because word of mouth can either make or break your clientele. We initiated the service of hi tech 3 years ago for my dad. my dad is now late. Their medical service was great when they arrived because the Govt ambulance did not make it over. Mind you we paid for the service. We were going to continue our relationship with hi tech, but decided to go with our current service provider whom we have for our current home. Whilst Hi tech was very helpful when we were their clients, which I will not deny, but as soon as we signed up with another service provider the conversation that I had with the manager was not on a professional level. I have dealt with clients for over 30 years and I would have never lambasted my client on the phone if they were leaving me. All I heard was how we have got everything for free. I barely got 2 sentences in the whole conversation. Hi tech have removed the radio system but did not release the panel to default so that the next service provider could put in their code. This is where treating customer fairly comes in, because clearly as a service provider you would part ways on a professional level so that you will still get referrals irrespective of the reason your client has left your company instead of throwing a tantrum on the phone with your resigned client.