After you file

I filed my tax return at H&R block on 2/23/2020 i didn't hear from the Irs nor h&r block so I decided to call the irs the lady told me my refund was under view I don't understand why its being reviewed then I called h&r block the tax paper told me she didn't know why it was being reviewed I payed $676.00 for my refund to be submitted I haven't received my refund