Xps 9550 battery swelling causing malfunction and harm?

Hi, I have a Dell 9550. Recently I noticed that my track pad was bulging up and exceptionally hot until it stopped functioning altogether.  I called Dell, they acknowledged over the phone that it has been a common problem that the battery of the 9550 swells, causing the trackpad to not function. Because my laptop is still within warranty (and will be for 2 more weeks), they decided to send a technician. However, the technician never contacted me and never came!

How should I now proceed? I contacted dell support again using my express service code, but the person hung up on me. <Removed - Legalistic>,. This defect in battery is a severe liability that can - and will - cause serious harm.  

 

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