Block Sender disappears from list

shanti

New Email
Hi, I keep tring to block a sender to my hotmail account. Their personal email address remains on the block sender list but their work email address remains on the block sender list for a few minutes only then disappears. I have tried deleting from my block sender list just in case there is not enough room. I am 'fed up' receiving these emails and need help please!:hammer:
 
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