3rd Home Internet Unit

It has been some time since I have had my home internet service. Previously, I was informed that the maximum number of devices that could be connected was two. I am curious whether this is indeed the case. I visited a corporate store to cancel a watch line. To my surprise, after I left, the individual I was working with opened a third home internet line on my account. This occurred approximately nine months ago. I contacted the help the following day, and I had it removed. It appears that a specific code is required to connect a third unit.