When reading this as an electronics engineer I can not help myself, I have to leave a comment 
Just as a reminder, which is valid for LiPo and LiIon-batteries:
The thing that really causes stress to these kind of batteries are situations when they are very full on charge or very low on charge.
The best idea for a long living battery are “flat cycles”: Avoid charging them more than 80%, avoid discharging them lower than 20%.
Or, the very best would be to cycle them just in a range between 40% and 60%.
Of course, this is just theoretical and nothing that people will do in daily life
To keep it short: The longer this kind of battery is kept next to an extreme level (high or low), the sooner it will die.
Your method - waiting for the discharge reaching almost 0% and then recharge it - is valid for the old-style-batteries (NiCd, NiMh, etc.), mostly to avoid the memory effect which is not a problem on LiPo and LiIon.
So my general suggestion would be to reconsider the way you are charging the battery in order to keep it working as long as possible. (*)
But of course, even in the way you are doing it, it should not bloat this way after you are just using it since October 2019. So, yes, ask for a replacement.
And please be very careful with bloated batteries! If a LiPo or LiIon battery feels sick and not comfortable, it sometimes tends to put that feeling to its owner - an experience you really don’t want to have
(*) For example I am using a bluetooth-speaker every day, charging it in flat cycles (around 30% - 100%, using it immediately after charging, so it stays not at 100% for a longer period of time). The battery is still working perfect after (I guess: more or less than) 12 years now.
Not really. All of these PMICs, containing the charging circuitry, are doing it in CC/CV-mode (the usual way these batteries are charged; limited constant current first, then decreasing current when the voltage reached the target value).
Both the PMIC in the phone and the protection circuit in the battery protect it from overvoltage (which would lead to fire and explosion VERY easily).
So, keeping the phone on charge all the time will not lead to “slow overload”. It will lead to a situation where the battery is at 100% all the time, in an extreme level, which leads to faster wearout.