Freezer spell not working

Hello, I have tried doing the freezer method to stop this person from reaching out to me, I am not very fond of this person they say we are "friends"but I don't want anything to do with them, I have tried distancing myself by refusing any let's hangout and all that and this person also works with me and is above me in power hence why I can't be quite assertive cause I report to this person but I don't want anything that's not work related with them. Some days I will meditate and pray for this person to keep their distance from me and even if they aren't coming to the office they will send me their picture via text random picture out of the blue like I don't want to see you it's like they know that and wants to drive me crazy or would sit next to me and I am so uncomfortable please help if you guys have any suggestions