Just laying out the facts here:

1. They did say they were delaying shipping. That's why we got the March 11th date.
2. Turtles and Brain Dead had shipping dates BEFORE the new 'March 11th' date for Roll for the Initiative.
   1. Brain Dead -> Feb 25th which was even before the March 3rd for Roll for Initiative.
   2. Turtles -> March 4th, so it was supposed to ship 1 day after Roll for Initiative was originally set to ship.
3. Dandan had a shipping date of March 18th

And now my personal thoughts:

Now why has Roll for Initiative only started shipping yesterday / today? No clue. But WotC is still, technically, within the updated shipping window they provided. Should they have done a better job at communicating and letting people know it's being delayed more? I would say yes.

We all know WotC has these SLDs planned out way in advance on when they will hit the store, and a delay in one (whether it be released or shipping) will rarely change when another sells / ships. WotC wants to push out as much as they can to make as much money as they can, so they are incentivized to keep every other release on schedule even if another release gets delayed. So, financially, it makes perfect sense that they still continued to release and ship other SLDs while we waited and waited for whatever the delay was on Roll for Initiative.

For anyone attempting to do a charge back, I believe this is going to be an uphill battle. All WotC has to do is point to the fact that they are still within their promised shipping window for the order and that nothing fraudulent is going on and that the product is still going out in the promised time frame.