I absolutely despise my summer job

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I'm 18 and work in a pub. When I started, I thought it would be a good way to make money and gain some customer service skills.

>the managers are nowhere to be seen
>when they do appear, they're surly and rude
>one of them barely speaks english and accuses me of not being able to understand English when it's just him I can't understand
>I can't maintain a relationship with them, they barely return my calls and texts
>I don't even know what days I'm supposed to be working this week because of the above
>the supervisors always shunt me into doing menial tasks when I want to be doing at least a bit of customer interaction.
>when I am told to do customer service, I can't actually do it because they don't let me have access to the fucking digital order logging system
>have to pester someone else to log me on to it every single time
>chaotically run environment, always receiving complaints from middle-aged who have a stick up their arse about muh no parmesan on chicken caesar salad, has terrible google reviews
>I hate the unsociable hours (5pm-1am but it's effectively 5pm-4am because my coworkers will think I'm a cuck if I leave early instead of staying till 4am to drink and chat) - sleeping patterns fucked because of this insane expectation
>minimum wage, haven't been paid yet because 'I didn't get my credit card details in on time' (I gave them in a week in advance?)
>generally introverted, loud environments are painful

I dread heading back to the job every waking hour that I'm not doing it, and if I continue it'll make my entire summer miserable. The only redeeming qualities about it are my coworkers. Yet everywhere I look online, there are blogposts telling me that I shouldn't quit. Give me (1) good reason not to quit. Heck, I don't even know if I'll be able to, given that they don't even answer my calls.