Quikr — Commercial Vehicles sale

I had posted a add to sale a school bus on Quikr .. 1st executive called me and told me to pay 2999 for ad.. I dint pay and waited for free response... Next day on Bakri I'd another executive called me and said you have offer so you can take gold premium package at 1999 and if vehicle doesn't sale in one month you will get refund.. I said ok and paid through upi.. I have screenshot of payment and also recordings of both executive..
Next day again they called and said pay 1000 then only you will get calls for your add or else no and there is no refund also... I haven't got one also call for my add till now and executive is not picking up my calls and forcing me to pay more 1000/-