Foster care

Good day Kindly help my grandma and my mother did foster care for 2 kids (twins) Atteridgeville social worker since she dropped when they were 2 weeks, now they are 17 years she never came to check up on them even during covid no food parcel nothing. They survive on grand and my mother's salary. They buried their mom, did tombstone for her. My grandma never received any money for looking after the kids. Now she is 72 years she can't anymore. We asked the social to take them to place of safety she is refusing. Urgently help