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Unfortunately, there are many illnesses that can plague clover. Unfortunately, your photos did not come through. I am unable to see the damage.

There are a few that do prefer the heat and rainy season. I suspect Anthracnose, but cannot confirm.

https://www.gardeningknowhow.com/plant-problems/disease/anthracnose-disease.htm

When you say "watered regularly," does that mean every couple of days to keep the ground moist, which is what the seedlings need.
Birds may have gotten the seed if it wasn't raked in or covered lightly.
I suggest calling the company and letting them know your experience. They will likely make some concessions.

Here's a helpful article: https://www.gardeningknowhow.com/plant-problems/weeds/getting-rid-white-clover.htm

Microclover doesn't tend to like extended periods of heat and high humidity. It may be a little too much for the plant in your area, unfortunately.

If you choose to reseed, continuously, then you will want to use about 2 lbs per 1000 square feet of yard.

This article will offer more information on microclover:

https://www.gardeningknowhow.com/lawn-care/lawn-substitutes/microclover/microclover-care-in-lawns.htm

Adding coco coir and worm casting to these bare spots and reseeding will, likely, solve the issue. This will help these areas to maintain a, more constant, supply of moisture while the clover establishes.

This article will offer more information on how to get the soil to hold more moisture in those areas:

https://www.gardeningknowhow.com/garden-how-to/soil-fertilizers/soil-dries-too-fast.htm