MULTIPLE DVR RECORDINGS MISSING AFTER REPLACING X1 BOX

My X1 box wouldn't reboot properly after the daily late-night download/refresh and since it was the master box, no other boxes in the house would connect to cable. A service technician changed the box out and restored cable; HOWEVER, 30-40% of my DVR Recordings automatically deleted.  Several of these programs will not be repeated.   I specifically asked the service rep if I would lose any of the recordings and was told "NO"before he swapped them.  After box was changed out and cable restored, I reviewed my recordings/schedule recordings, and they were showing; however, I went back in 2 hrs later and several shows had disappeared.  I called the help desk (Comcast Service Center) and the rep acted like he had no idea what he was doing and refused to send my ticket to 2nd level support to attend to attempt to retrieve the lost programs. I have a feeling that the issue is that these programs were over a year old and when the new box was installed my account had various programs automatically scheduled, which I had not scheduled myself (or any family members) this jumped the usage to 83% - there internal coding that starts deleting at 73%). Last year my system had reached the over 73% full and started to deleted programs. I called and was told that my account was changed so that NO programs would be deleted based upon Capacity level or age.  Again was told incorrect information by a Comcast Rep.  I have spoken to 4 reps in the last 2 hrs on this issue - each has told me something different.   Looks like I might be looking for another source of Cable.