I've already contacted costumer services about this problem, but they failed to get back to me.
3 weeks ago, as I usually do I put my phone on charger overnight.
About 2 hours later the pungent smell woke me as I noticed the phone melting around the charging slot. I've immediately switched off the wall socket but as I tried to remove the cord from the phone it broke. The charging port was damaged, not that I would like to charge this phone after this.
Since the phone is almost 2 years old it doesn't have warranty anymore, but I feel like this is a problem that shouldn't be happening to a device no matter how old it is.