A Very Bad Customer Service

Its me again with Hyundai Germiston, For 3 months having my car Venue 2020, I paid the money the wanted me to pay unfortunately it was more with R400. I told them immediately about it after 3 weeks Prelin told me to send documents in order to refund me, I did send it. When I called he ignored my calls or he is unavailable. I spoke to Alvaro the Manager and he promised to follow up with him till today nothing yesterday when i called Alvaro is no longer working there same story like Busani. Sindi who works at service department with Prelin send and email to Dikeledi from finance to call me or check if she received the documents from Prelin. No call no feedback till today. They are holding my money now, which means the ******, unprofessional and pathetic, that dealership its a joke, they even hide each other,