Iphone 6s still on red charging mode what to do?

I went to get fixed well i did have a cracked screen. Apparently I have a faulty battery and would need to seek an apple store for help. The guy said I was able to use it until the battery dies then charge it again which was BS. I won't be near an apple store until early May. Wasted so much money when my phone being cracked wasn't an issue with the use ofmy phone. Suppose to replace my battery yet won't fully be able to do that until early may.

IPhone 6s won't charge unless cord is angled?

IPhone 6s won't charge unless cord is angled?

Added (1). My iphone 6s started to charge extremely slowly yesterday and today I can't get it to charge at all unless the cord is bent at just the right angle. I have tried using a pin and similar to remove lint from the phone's lightning port and it looks clean but I still can't get any better results. Any ideas?

IPhone 6 Mic not working? The rear camera picks up sound just fine but when use the front camera, it's all buzzy with sound very faint

IPhone 6 Mic not working? The rear camera picks up sound just fine but when use the front camera, it's all buzzy with sound very faint

Added (1). So Siri doesn't work and neither does voice texting. Like I said filming with the front camera leaves a buzzing sound, and a very faint audio of what I'm recording (my voice). Voice memos works fine. I got the phone refurbished a few weeks ago, but don't remember if it was working or not right when I set it up.