Upset about service

I went to Edgars in Liberty Promenade mall and bought a new nokia handset cash but in just two weeks it didnt want to charge and it wouldnt go on so then i took it back to Edgars but they told me it must go for repairs and in 6 weeks i should get it back or get a credit voucher. In 4 weeks i went back and they told me nakia gave me a new phone but the phone had a password on it that wasnt mine and the lady at the Edgars counter could not unlock it either. So now they told me that this phone also has to be sent back and i have to wait for another 6 weeks and now you can imagine how upset i am about this and i really needed this phone.