Aquagrand - Aquagrand RO Repair

Sir, I have purchased Aquagrand RO plant through Just Juldi.com in the month of APR **** and is under * year warranty for electrical parts. But, on ** Dec ** my RO plant was unserviceable and the same was intimated to Just juldi.com and the provided servicing of the same, they told me to pay an amount of *** online then only the technician visit your home, I paid the amount online and Technician came and told that one Part is not serviceable it has to be changed and it will be cost *** rs, I asked him as the product is under warranty and why you are charging money, he told it will not cover in Warranty, so I paid the amount of *** but he has not given any bill, again on ** Jan ** the same problem was started and I called the service center and explained again they told me to pay *** for technician visiting charges, I paid it online, till now they have not sent any technician to attend the product. I repeatedly calling them but no response.