Motorola — Need replacement of new mobile

My name is Komati N V Manikanta Chowdary and my mobile number is [protected]. I purchase motorola mobile on may 2015 .In hyderabad service centre i gave my mobile for 2 times in june and july due to software crashing and hanging.The 3rd time i gave it in Banglore service centre, they checked and said motherboard was gone and while we try to repair it the display was also gone.we made a order to company for them and said you will collect in one week.After one week they told the spare parts not received.I called to customer care and they said you got a call on[protected].I got the call and the concerned person said that you mobile will be delivered on[protected].Again they changed the delivery date to[protected] and agian changed to[protected] and he said at any cost the mobile will be delivered.I made call to service centre they told we didn't receive the spare parts.Please do me the favour for replacement of new mobile because i Just bought it ago 3 months.But the mobile is stayed 1 month 10 days in service centre.Please help me in replacement of new mobile.