请问OPT Extension case received 75天后才可以联系客服？

本人是1月25号case received的，到今天位置状态还是case was received, 后边特别多都已经approved了。4.10就要75 days。所以是满75天就可以联系客服inquiry么？还是要90天？每天都查状态，真闹心。谢谢大家！