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May Allah bless you and keep you steadfast upon your Deen my brother. I'll answer you insha'Allah in points. - There was a similar situation in the era of prophet Muhammad (peace be upon him). Asma' bent Abi Bakr (may Allah be pleased with them) told the prophet (peace be upon him) that her mother came to her and her mother was mushrika. She asked the prophet (peace be upon him) if she can be kind to her and he said yes. - Making your every effort to guide your mom to Islam is a great worship which need patience and attempt. Search please about the story of Abu Hurayra (may Allah be pleased with him) with his mom. - You cannot change your mom's life in 4 days or week! I know that it's very painful to hear what you mentioned but you need some patience. Sahabah (may Allah be pleased with them) were hearing more painful words from their families. - Apologize to your mom, ask her to stay, tell her that you were confused and try to speak with her clearly and quietly, tell her that these calls hurt you and you wish her to avoid that when you are at home, etc. - Make a lot of Dua' for her.