Second complaint in poor service

This is my second complaint.We bought a Sony E5 phone in August last year with my partner and in January 2016 the phone could not switch on, we went back to the shop and was informed that the phone will be booked for repairs for 3weeks but it came back later than that working. Now in March the phone does not want to switch on again and we went to the store to inform them and they asked us again to book the same phone for repairs again and one of the assistants in the shop informed us that she knows that the phone we have will keep on giving us problems as she is used to it. We are now too sceptical to take the phone for repairs because when the waranty has been completed they will no longer be able to assist us and we bought it with an intention to use it but now because exact sells faulty goods it looks like we will not use the phone. We don't even think we will wish to buy anything from Exact because of the unfair treatment we are experiencing and we are even considering contacting the ombudsman to intervene because Exact is failing us. It looks like they don't even care how much money we spend travelling to their store to sort out this issue with their phone