Hero Motocorp — Didn't get Goodlife gift voucher in Diwali offer and extra demand of money after bill playment

Address:

BIJAYALAXMI MOTORS,JHARSUGUDA

I have purchased a new Hero Pleasure-Xtech on 26/10/2022 with advance booking of Rs1100/- during Diwali.Diwali offer was to get Goodlife gift voucher of Rs4000/- after billing.
After payment I didn't get Goodlife voucher link and contacted the same showroom.They verified and informed that mobile no entered in Invoice was wrong and after RC copy upload mobile number can be changed and I will get the link.
I visited the showroom very ofter for the issue and after all the formalities, till date I didn't get the link and now they are approaching me to pay extra abt Rs3500/- as they qouted for wrong variant.
More than 2 months over but issue is unresolved till date.