Lumia 535 dissapointing

Bought a Lumia 535, the phone was not picking up a signal.Took this back to the store (Markham Gateway), the store assistant could clearly see that there was something wrong with it as he had tested other sim cards and tried to change settings however nothing was working. They then said that the money could not be refunded as the phone had to be sent for an assessment first. This took 10 days to do which meant that I spent a lot on airtime and travelling costs.money was returned and I then purchased the same phone at Sportscene Gateway last saturday. Now the app store does not work with normal data AT ALL, when using Wi-Fi it connects to the settings to create an account and then cuts me off, it did this over 40 times!!! I cannot download whatsapp and the BBM never works. photos that are already saved on my memory card do not pick up. I have a phone that is totally useless right now. I cannot return the phone within 7 days as I live in chatsworth and that means I must travel to gateway which will be pointless because the phone will sit in the store passed my 7 days period anyway!! and when I emailed the tech suppt they copied the words from the site and sent bk to me.no help!