5% cashback on auto bill pay with SBI cc

[aish111]

SBI cc is offering 5% cashback upto 100 for first 3 auto bill pay. i.e. cashback upto 300 per account.
Validity 1st July to 31st July.

 

[credit_debit]

What after first Cashback? (3 bills registration)? No rewards for subsequent bills? In that case best to buy vouchers on Amazon and get 5% every time.