Hacking problem HTC One M7 International

I hope this is the right place to post this. I'm a total newbe with a serious problem..
Someone called from number +972542241849

So i answered this number but noone talked so i hang up

I tried calling throughout the day from different phones and it says the costumer cant accept my calls
It was showing on my call logs

A few hours later I had another look
on my call logs and no calls from or to this number showing
I wrote it down and also saved it to my phone
So i started texting it...

Closed the texting window and reopen and no texting shows
None

So I texted several more time thretning messages
And now it shows messages records but no call record even if im calling it immedietly vanish from my call logs

Could anyone explain me what does that means.....?

This particular incident is just one of many other signs that I'm having a constant problem in many different variations.

Thank you in advance! ??

Sent from my HTC One using XDA Premium 4 mobile app

P.S im trying to learn if the access was gain to my call logs and is it to the rest on my phone.. do i need to restore my phone? What can i do to gain some privacy and if???

Sent from my HTC One using XDA Premium 4 mobile app

Wow, 3 hours 102 views and no one comment, advice... Word??!?

Sent from my HTC One using XDA Premium 4 mobile app

Firstly, thank you for bothering to reply... I have had this problem for a long time in many different variations. It was not just the call logs its also text messages. No it is not a wrong number... At first i would send texts too and there was record, but less the half an hour later they were not there anymore. Strange! I cant determine if its on my device or my carrier. How could I ?? I understand that
S-OFF will give me some security..? As far as all my internet accounts and emails, i do not have privacy what so ever and i got use to that, but on my phone, how could existing call logs and text messages vanish without me deleting it?
I am fully aware of the reason and know its happening. This is the main reason for me to join XDA in the first place, to try and learn how I could trace the source and prevent some what the dammage.

Sent from my HTC One using XDA Premium 4 mobile app

Well there is always the first time in which you learn. Not familiar with this time rulles. I know either my device or through my carrier is being hacked.

Sent from my HTC One using XDA Premium 4 mobile app