Vodafone — Cashback did not receive of rs 100

Rs 75 is my regular coupon below that it's mention 100rs cash back.i confirm with the executive Tham I recharge ...call records by the executive r wid me infct they said first our executive said u wrong den they said in our system it's not showing wen I show the screenshot dey r manipulating ...I aways do n redeem rs75 coupon but this time rs100cashback is mentioned I called to executive even to confirm by which mode shoiould I do den dey said definetly u will get rs100cashback which u can use further n this 75 is like ur regular coupon only hv to pay rs324
They r cont. Manipulating infct I went thrice to Vodafone local office for the same