They did not want to pay my refund amounting to R2724 I gave them my bank details through my email

They did not want to pay my refund amounting to R2724 I gave them my bank details through my email . They were already paid by my medical aid in full and I was also paid them because they threatned me of taking me to the lawyers they get double payments but when I requested them to pay my money back they requested unnecessary documents from me Hinesh the Mager there did not pick my calls and also the receptionist called Sharon also not answering my calls please help me I want them to thrend in Social Media because they are not suppose to receive money for services they did not render to me.They are not suppose to keep my money although I do not ow them even a cent.