Redbus — Wrong booking of ticket due to app error

Myself kareem, I tried booking a bus on 3rd Feb from Koyambedu Chennai to Bangalore around 6:10 pm, even though after selecting the source location as Koyambedu, after confirmation and payment completion it was booked as vellore for source location. Tried calling the concerned travels but they dint receive my call nor I received any response from them till now. Kindly reimburse my payment.