Hi, Can anyone recommend an independent assessor for an ASUS memotab 301 tablet please. In dispute with PCWORLD

Just seen them again and they are going to get a detailed report from ASUS. Any one know of an independent assesor for a tablet?

End of April I bought a memotab 310 and after around a month and a half the chargeing port became faulty, the plastic holding the pins in place has broken. Took to pcworld and was advised if it was user damage I may charged for the repair. After 2 weeks chased the store and promised call back but did not happen. Phoned the 0844 number and promised store would call but no joy. Finally some five weeks after I returned it called into the stores and got a call back week later saying damage my fault and would cost £249 to repair, New item is £229!!!. Told them not acceptable to return it and being told I have to pay for its return and to deal with ASUS direct, told them my relationship with them but falling on deaf ears. What annoyed me beyond belief is that there is no details of why they believe its user damage. I take care of my stuff and 1000% certain I did mot cause it or mistreated the item. The shop manager speculated it was the way the charger was inserted and pulled out, its a micro USB and no way you can access the inside or twist the port. I am incensed at the their attitude and behaviour, so much so that I have complained to trading standards and need advice on how to take it forward, even through to small claims if neccessary. Thanks in advance for advise / guidance.