Resigned but my notice period is 3 months for probation

I, 29M, have just recently submitted my notice of resignation from my company due to unrealistic expactation and toxic workplace. I know it sounds like every other persons problem but i needed advice.

I've tried calling in and reaching out to the Labour dept but the call lines don't work and i'm stuck in the wait line at the nearest office.

My boss has been pushing me to carry out jobs that are the level of a developer, programmer and even a designer. I'm a digital marketer by trade and I simply cannot do any jobs that require me to code in HTML. When I accepted the offer, i was told that I would be managing a team of 4 people but it turns out, i was the only person to reprise the role. My initial duties were to craft digital strategies, managing CRM, social media, and paid media.

I have informed my boss that I needed a graphic designer as I could not design and developer support for any integration of platforms. I could not convert or fix EDMs that are in HTML or implement CRM platforms into mobile apps or websites. Whenever things did not work nor I could carry out the job because it was beyond my capabilities, it was treated as excuses.

This led me to tender my resignation. I wanted to remain professional and carry out whatever is necessary to the best of my knowledge while i serve my notice in the course of 3 months. Do take note that I'm still in PROBATION.

I recently came down with an eye infection which would affect my performance at work. My literal eyes are needed to work but my senior collegaues and my boss are still pushing me to deliver my job within timeline. The timeline that was outlined for me was too short and the job requires someone to program the platform for me to use and build campaign automations. It wasn't setup very well, and i was given EDMs that were not coded properly to implement. Nevertheless, i still built the automation but the EDMs are broken. Despite submitting my MC, and completing the build (with the broken EDMs that i couldnt fix), they still think my build was not up to what they expected.

What should I do?

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Minor UPDATE: Thank you everyone for sharing your viewpoints and advice. I truly appreciate all of your kind sentiments towards my situation.

As of now, no one is bothering me over the phone as I've been hospitalised. To let you know, I do have an opportunity waiting for me, it's not much but it's something. The only thing that could make or break that opportunity is the notice period.

I've decided to lie low and simply do what I'm capable of. Emotionally and mentally, it will be taxing on me as they will come up with methods to break me into doing their biddings. They've seen what I'm capable of doing and definitely will try to 'force' me into outperform as they know I have an ego about getting things done.

I'll keep y'all posted once the working week arrives. Have a wonderful Sunday. MERRY CHRISTMAS AND HAPPY NEW YEAR!