Bad Customer service

Case: 979573S My laptop was sent back for intermittent functionality . They kept it for more than 21 days claiming there is no fault found during the diagnosis. There was no diagnose until I threatened to escalate the issue the they come telling there is traces of liquid which is a question mark because this laptop gave us problems from the 1st days we got the device ... I'm really want answers on how the device was checked the first time. And I'm unable to get answers the person I spoke to at repairs was very rude and not co operating. We would like answers from Acer