We made arrangements with an agent to send a technician to come and remove an old tracking device from our old vehicle and install the same device into our new vehicle

We made arrangements with an agent to send a technician to come and remove an old tracking device from our old vehicle and install the same device into our new vehicle. The lady at the call center told me that will be free of charge. Today our account was debited with R600 Phoned your call center again and they told us it is for a new device installation So please advise where is our new device?? Cause this was an old device installed.