Anyone getting spam from margarita's club/bar?

I seem to be always getting spam from them for promotional stuff, I don't even like clubs.

I've tried opted out many times but just does nothing,

They send text with lots of different numbers (021, 027, 022's), and when you try calling them no one ever picks up.

I've called up the bar, and I've been in to talk to a manager and they say OK, we'll get that sorted for you and they all SAY they'll remove me from the txting database, but this never happens.

I've tried to find the director of this club/bar, and on the website it says the registered name is Margarita's Ltd, which isn't even a registered company in NZ, the closes one is "MARGARITA'S BAR & RESTAURANT LIMITED" which went into liquidation in 2003, I called the domain admin (which I dug up from a who is website) and he said he hasn't been involved since like 10 years ago... and he said the original Director is no longer the director of that place either.

I've tried calling Vodafone but it always seems to be busy I wait like 20mins on the phone and get sick of waiting and hangup.

What can I do?

Should I just suck it up and wait on the phone with Vodafone until someone picks up?