I was offered and interviewed for a store keeper job and now asked to work as a cleaner

I was offered and interviewed for a job in online marketing in a mainland company on a limited contract basis on a Store Keeper visa.

After a couple of months, they want me to do helper and cleaner work as there are no ongoing online sales and I never got paid a salary on time. Every time I need to beg for my salary in the middle of the month!

I now would like to know what are the legal consequences I will face if I break the limited contract (in my contract it was mentioned in Article 7) as it is taking a toll on my mental health.

Could you elaborate on this, please?