Message spam from 952

Hello everyone,
So, I've had the Samsung Galaxy Ace for about a year and a half, and I really don't like it at all, but I have to deal with it for now. Anyway, for about the last 5 months, I've been receiving a message from 952, but this message only appears in the sliding window at the top of the screen. I slide down the window, and when I click on the message, it should normally redirect me to that message in my inbox, but instead, it redirects me to a blank page as if I were going to write a new message to someone. Following this unbearable bug, I downloaded Chomp SMS so I wouldn't have to deal with this message anymore, and indeed, since I've been using this new default messaging app, I haven't had any problems with 952 because I no longer use my default messaging app! But it's been 3 months since I got Chomp, and I'm getting tired of it; moreover, it crashes and slows down my phone, so I uninstalled it to see if the problem had stopped, but no, it's back again! The message keeps being sent for no reason at all.. And I don't want to download another messaging app again since it just crashes my phone even more than it already does.. So please, does anyone have or could find a solution to my problem? It would really be kind of you.. !
Hope to see you soon!

PS: the message is: Info SFR: you can use everything [...], and then I can't see the end of the message

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