Dell Computer We sent a working computer in for repair. They broke the case and failed at repair, Tried to charge us under warranty Nationwide

This is my 5th Dell computer since 2003.  It is less than a year old and developed a charging problem, was diagnosed via remote desktop by Dell computer as a bad I/0 daughter board.  They were on our working computer via dell assist and diag the problem, sent a call tag for repair.  After we sent the computer out we were called and asked for money to repair a USB port that they said was broken.  We advised them that no usb was broken and that is not why the computer was sent out for repair that it was sent out for the board replacement which was internal to the computer.   The I/o daughter board and the usb had nothing to do with each other and that the usb had nothing wrong,  we refused to send in money.   We sent the computer into dell repair in the original box and packing from the factory. 

Dell called twice asking for money for a usb replacement.  both times we refused, stating that the computer was sent in perfect condition minus a battery charging issue and that we had never had a complaint or problem with a usb as it was working fine when we sent it in.  Finally, we received the computer back,  it was in the wrong box and not in factory packing that we sent it in with.   I took it out of the box and immediately noticed that the factory intel labels were missing from the case.   I also noticed glue on the case and you could tell that the case had actually been burned together in places with a heat gun.  The upper and lower case was broken not the usb.  They broke our computer then tried to charge us for repairs under false pretense of a non-warranted usb being broken. 

We refused so they then attempted to repair the broken case.   I then powered the computer on to get a blue error screen saying no bootable device found.   Our computer was damaged and returned in nonworking condition.   It has now taken over a week to get a response of which we are being called liars and basically told they would take the unit back in for repairs but would not replace it, or our box, or our factory labels that were on the computer.   We agreed to a repair vs a replace if they would extend the warranty due to the nature and extent of repair to replace an entire case.   We were then told to be sure to back up our computer.   

What a joke.  It will not even power on now with a blue screen that says no bootable device.   This computer was used by a 74 yr old woman at a desk to search for recipes and use facebook.  It was in immaculate condition as witnessed by multiple family members and was in perfect condition other than the battery would not charge.   The way we have been treated is an outrage.  Break a personal computer, try to charge them for it, fail and attempt to hide damages and return in not working then call the consumer a liar.   It was my 5th dell computer and could of been a lifetime or another 50 years of them but Dell has failed me in every way.   Outraged in TN.  My 5th but last.