With a budget of ~3 Million PKR and Saloon / Sedan, I would advise to go for a brand new, locally assembled car. Given that, the only 02 options in market are Honda Civic or Toyota Corolla.
I would personally recommend Toyota Corolla (any variant which matches your budget, and on-road price). Its more reliable, rugged, mazbuut and paidaar in comparison to Honda. Easy on maintenance. Parts are also easily available, but irrespective Honda or Toyota, genuine OEM parts of both brands are quite expensive.
Brand New car will only require regular periodic maintenance as per schedule. Other than that, it won't give any headaches regarding parts, or electrical / mechanical works, etc.