Aavin Milk — Vadapalani milk packet provider near pond rudeness

When missed collecting milk, requested one packet for yesterday, the milk vendor was shouting that he cannot provide additional milk, provided we have to talk to the office(Ashok pillar parlour office where they provide cards). This is not the first time, he often creates something or other issues as if he is providing free service or milk. For emergencies people tend to miss getting milk that is not the biggest blunder that he can talk about as he is following laws.
That does not mean he can talk as he wishes. Let me know what's the procedure to collect missed milk.