Hi Riyaz,
I may have missed your question, but I think your formula is doing the same thing as these:
=VLOOKUP("*",A2:A20,1,0)
=INDEX(A2:A20,MATCH("*",A2:A20,0))
You can also add a check something like:
=IF(SUM(COUNTIF(A2:A20,{"DIAMOND","PREMIERE PLUS","PLATINUM","PREMIERE"}))>0...