Disappointed in the bad service Cartrack gave me

Cartrack was overcharging me for 9 months on my one vehicle for my cartrack unit. I phoned them in June and they promised to repay that money into my account. On 2 July 2018 an amount of R2025 was debit from my bank account by Cartrack. I phone them on 2 July and they admit they made a mistake, they will return my money into my bank account by 4 July. Today it is 5 July and Cartrack did not return my money. I phoned them again...... they will go into the matter and phone me back. I am terribly disappointed by the way Cartrack handle this situation. It is absolutely bad service from them