£0 remaining for a mobile phone debt

A, a vulnerable gentleman, has had his phone cut off, having gotten into £30 of arrears. The company have now added a £200 fee for early termination of his contract and it is with a debt collector. A's phone is vital, he has multiple health issues including mental health problems. Citizens Advice have contacted the supplier to ask they put a hold on the debt so it does not increase. Please may you consider helping this gentleman to get his phone back? Thank you.