Plaintiff's Right to Eviction in TPA - Conceptual Confusion

Bro, I'm stuck on this TPA chapter, especially on eviction by plaintiff. So, if a tenant doesn't pay rent, the landlord has the right to eviction, but what if the tenant says the landlord didn't make the necessary repairs? In other words, if the landlord is claiming rent due to the tenant, but the tenant argues he didn't receive his property in a fit state for dwelling, which law prevails? Is it the 'Rent Act, 1948' that protects the tenant or the landlord's 'TPA' rights? Please clarify, koi help?