How do I growth hack a hyper local startup?

Hyper-local startups can be challenging because you're limited to marketing them to "nearby" customers, rather than anyone who has an internet connection in your space. However, this hands on approach can also be beneficial because you can engage directly with your customers. The hard part is getting people to give you the time of day.

We launched Just Booked (justbooked.com) as the B2C Uber eats, in that we do bulk orders for offices to feed teams. In short, we make ordering office lunches, simple. You can order by platter, or by person whether it’s sandwiches, salads, pizza etc... order with 24 hours notice and have your team fed the next day with a great meal.

With that said, the product is built, I've printed up t-shirts (swag), and 50% off flyers that I've been giving to the receptionist's at offices, however no orders yet :(

Any advice on growth hacking this business would be awesome!

-- Note I'm sure the advice in this post will help others with similar businesses :)