Hey, there's no need to worry. Even I didn't receive the sms since 2 days. You just email them with the mailing ID provided. (with your name , slot booked and your number). Due to some technical issues they might have not done it. It looks like many of the students didn't receive the sms. If not then also try giving a call on the numbers provided at the website.
Hope this helps !
All The Best :)
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