Why would an iphone 4s's UDID and Wi-Fi MAC ADDRESS CHANGE?

Are these numbers embedded in the hardware of my iphone or can these numbers be changed

Via software or app? My phone has been having problems for a few weeks now... Calender events

Erased, photos deleted from both Icloud and 3rd party apps installed on my iphone, random spikes in data

use on certain days. (As of 10/17 3:30p, 1.3gb of 2gb already used w/2 wks left) My ave. is about 1.5gb/mo.

I have "Fing" & "Inet pro" network scanning apps installed and both are consistent in my MAC address and

UDID Numbers different than in previous scans from a month prior.

I have a problem with someone stalking me via hacking into our home nw. & possibly cell phone. This stalking has been

going on for several yrs now. But No proof no arrest. This person

has extensive knowledge in computers and electronics, w/ advanced-user skills in anything electronic.

I have reason to believe that my iphone might be hacked or even replaced with another Iphone device after discovery

of MAC/UDID changes. Also, scan reports list my Iphone as "vendor unknown", when in all previous scans "Apple" was

identified. This person has gained access to my home & personal property in the past so access to my Iphone is a possibility.

* previous MAC address= BC:52:B7:6A:2C:DE

Current MAC address=02:00:00:00:00:00.

HELP!!!! Any feedback, info, or Advice would be greatly aporeciated. Trying to

Put a stop to this w/ little help from law enforcement.

Lynn