The two teams took one point each, confirming a top-two finish for table-toppers Kolkata
Ajmal grabbed 3-29 and Wahab 3-38 as the hosts struggled after being sent in under overcast skies in a match reduced to 45 overs-per-side by early morning rain.
Only opener Lendl Simmons, with 51 off 64 balls, and left-hander Darren Bravo, who contributed 47 off 77 deliveries, made any impression.
The pair added 86 for the second wicket but the rest of the batsmen failed to deliver with West Indies losing its last seven wickets for 40.
Mohammad Hafeez, who made the early breakthrough with the wicket of Devon Smith for the third time in the series, claimed 2-31.
Simmons struck four fours and two sixes in a fluent knock but once he chipped a low return catch to Ajmal, the innings subsided swiftly.
Bravo fell to Hafeez, and Wahab returned to dismantle the middle and lower order.
The two teams took one point each, confirming a top-two finish for table-toppers Kolkata
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