Xperia - Melissa warren -NO CUSTOMER SERVICE

This is my 4th Xperia Z1 cracked screen report about the poor service and product backup I am receiving from Sony mobile - Melissa Warren. Long and short, my phone screen cracked 15/12/2014 due to over heating. Handed in for repairs 17/12/2014 and after numerous non responsive emails to Melissa Warren, she aventually came back on 09/03/2015 confirming replacement of cell under warranty. Today 31/03/2015, exactly three weeks later I have not heard a word of any correspondence from Sony Mobile's Melissa Warren? This is after I have send her BY NOW exactly 21 emails. For me personally that has been a huge supporter of the product over the years, my trust and faith has been broken and leave a bitter taste regarding the product service, integrity and after sale support towards their loyal customers. With this type of \support