upgrading my contact, what a nightmare!!!!!!

I requested the Sony Xperia M4 Aqua, in white. At the time I was told that it would be requested and that I should expect my new phone within 3 days. The 3 days ended up taking over a week (almost 2 weeks), after the courier left I opened the box only to find the white phone is now black and the Nano sim became a micro sim. due to other commitments I queried this on the Monday and was informed that they do not have stock of the white phone and they also did not have stock of the Nano sim (What use is a micro sim if the phone uses a Nano Sim),also (Auto page decided that I will be happy with the black). Already having promised my old phone to someone else I decided to let it be and started using the phone. a few days later i was experiencing problems where people could not hear me. Thinking it was a setting I tried to resolve this myself to no avail. Exploring the internet I discovered that I was not the only person experiencing the problems but that it was a fault with the phone.It has now been collected by autopage & after my conversation with the call centre this morning i do not want the same phone as the response i got seems like its a problematic phone!!!