Dress still isn’t here

So I ordered my dress last March 2021. Was told delivery would be Dec- Feb but most likely February. I called on February 1 and the store was a bit rude- telling me not to call, they would call me when it got here and not to stress. They told me “the last week of February at the latest”. It’s now March 12. I called Thursday and Friday and left voicemails with no return call. I called today again, no answer.
While I understand there are delays they cannot control, I’m a bit turned off that they told me not to call them. Also I visited two other bridal stores recently for my bridesmaids upcoming wedding and they both told me this store has a bad habit of making brides pay in full and not ordering their dresses for months. Both stores also told me there is no delays with the supplier I ordered from. I’m a bit concerned. And I’m a bit mad that they’re not even returning the call to attempt some customer service. I need to know if my dress, shape wear and current headpiece are a match for this dress and we’re 96 days away…..

I guess my question is- how aggressive would you be with calling/following up? Dress was paid in full when ordered.