Sent away for repairs but received more damages.

After fixing my laptop, Acer sent the laptop back to me.<br> The laptop arrived in a foam and bubble wrap filled box with another foam laptop bag that I supp****. The laptop was sealed with plastic as well<br> I opened the laptop and I found that the inside of the laptop was damaged with a metal tool. This obviously happened in their workshop because where else would the laptop have been opened between me, the courier, and the technician that worked on my laptop?<br> The courier delivered the laptop when I was not at work. A colleague signed the form from the courier company but she did not tick the \All parcels Received in Good Order"as she did not know in what state it was and she left it sealed. Acer is saying that my colleague damaged it"