"I have purchased a mobile phone online from Yayvo.com on 23-Nov-2017. My order number is 100400467 and product model is Lenovo S1A40. The mobile is not working properly from the very first day and I have faced issues five times since I bought it. The phone went fully dead 4 times and was handed over to the customer care center in Lahore immediately. Today the same thing happened and this will be the fifth time. Tech Sirat issued the following serial numbers whenever the issue happened 16839, 17940, 18627, 19148. I asked for replacement the first time this issue occurred but the support team did not give any proper answer and each time the phone was returned with the assurance that the problem has been fixed. I have suffered great loss and mental torture since I purchased this mobile set as I have to leave my office to get the issue resolved. It is therefore requested to solve this matter once and for all by either replacing the set or by providing refund against this faulty piece."