Amy, a full-time carer with a degree in education, said her son has now been out of education since October 2024.
"We went to open evenings and did our due diligence," Amy said.
"I would like them to understand the damage they have done to my child.
"School is a place where children should feel safe, thrive and create memories, not come home petrified about going the next day."
Simon Dilkes, chief executive officer of the Forward Education Trust, insisted bosses were committed to the safety and wellbeing of pupils.
He said the former CEO of a special school trust would be appointed to look into the complaints, with an investigation due to commence on Monday 3 March.
"As part of our commitment to transparency and accountability, we will be launching an independent investigation to fully assess these concerns," Mr Dilkes said.
"Once we have agreed some details, a more complete timeline can be advised to interested parties."
Solihull Council said: "We are aware of concerns raised by some parents of children attending The Heights Academy.
"It is the responsibility of the multi-academy trust to investigate these concerns and we have sought assurance from the Trust that this is in train and will work closely with them where appropriate."