Recurring friends request

I have insistent demands of monsieur mourot to which I can not add when I add it it returns and asks me this done at least more than 100 times that it asks me to accept 4 times this person but the invitation return jonathan kay that does not Not working I have all try I also refuse the invitations but it comes back every time !!!
I have to accept four times but it comes back all the time
Can you help me solve this problem that becomes irritating please?

Since you have tried everything else Evan, you probably will need to create a new Microsoft account and use that for Messenger instead.

It does not come from my account I never had this problem before I have 2 microsoft accounts I will not make a third there is a solution I have trouble understanding the

add him via butterfly messenger.