Apollo Pharmacy — Unwanted repeating promotional messages

I have never ever used Apollo Pharmacy. I just looked for a medicine there only once and they asked to put my contact no. to look for delivery. The item was out of stock that’s why I couldn’t order.
But since then, I have been receiving reckless promotional messages from Apollo at least 3 messages daily .
Do you even have any slight idea how spamming and distracting that is.
I even got Do Not Disturb turned on …on my SIM.
But still I receive these messages daily even if I block them .
That is just outrageous.
You can’t just force people to buy your stuff.
You are just making people mad.
Remove my contact number from your promotional catalog or whatever or else I would have to take some serious action.