Bad horrible service

I made payment beginning of the year for stationery for my son. Then my son did not get placed at that school after they gave me details of where to pay for stationery… I sent them an email advising them of the unfortunate event that I had to find my son another school and I requested for refund. They said it will be proceeded and I understood but it has been long and I have been communicating with a certain lady via WhatsApp who is not ignoring me.. the WhatsApp number I have been communicating with is 0727764771.. like I don’t even know what to do now… I have tried calling with no success I have run out of options… am tired of trying to get my refund I need it as soon today… I have sent my details and I just want my money