This is the cooking service my son uses and highly recommends. He thinks it is actually cheaper than grocery shopping and cooking yourself:
Viandas saludables "Florando viandas"
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He also gave me the cooking service that his employer (an international corp.) uses, though they might not be suitable for individuals:
La solución para los almuerzos de tus empleados. Pedidos vía APP - Entregas diarias. Amplia oferta de platos principales, ensaladas, tartas, empanadas, pizzas, sándwiches, pastelería, etc. Todos los días opciones light, vegetarianas y sin TACC.
www.grupogala.com.ar
My son says there are others if you look online, though I don't know what you'd search for specifically.
Hope this helps someone.