Should I help my job or get revenge?

I’ve worked at my concierge job for a year and a 1/2. I started off full time then went PT because I was a college student and had to go back to classes. I eventually graduated and stayed pt for about a year because we already had a full time person. The full time person eventually would start missing days and needing me to come in early which was fine but it was constant.
She was ungrateful because she “expected” me to cover for her because of her sickness. We were close friends at work but that took a toll on us. She quit and my job asked me to come full time. I worked a few weekends last minute and they promised me a bonus and I never got it. Plus I stayed later because my shift ends at 4 and they hadn’t found a 4-8 person yet.
On the full time persons last day they threw her a party and got her gifts. I agreed to go full time hastily. My dad thought I should negotiate a raise. I went into my HR managers office and told her that I wanted to try and negotiate a higher salary. She then said the highest they could go was $18.50 / hr ( which is the starting for full time ) and said she thought we agreed upon that and she said she would push for upper management as high as she could go but the company had a budget and they had to stay within salary of other communities. I talked to my dad who said she could push if she wanted to and that if I quit they’d be in trouble. Fast forward a few months and I got my dream job so I’m leaving!! But it’s the month of December and it’s really busy. I am a sympathetic person and because I’m doing most of the work at this company I’ve thought about giving 3 weeks notice instead of 2. Which means I would have to do it tomorrow. My dad thinks it’s a generous thing to do to give 3 and my mom says I don’t owe them anything and to give 2.
I’m close to the Hr manager but everyone else eh. For my bday they want to me and have me balloons and candy but do that for everyone. Also once we took a company picture and they left me out lol.
Should I help my job or get revenge?
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