Worst customer service

My mother has an account with Sheet Street and they have been increasing credit that she owes claiming that she agreed to "free monthly airtime", she however disputed this claim and we have asked for the recordings for this agreement but nothing was ever supp****. No statements are issued to her on a monthly bases and she also requested that this account be closed since it seems there is an underlying issue of *****, however that has not been done as well. The customer service is the worst and it has led to a very stressful experience for my mother.