Bajaj Electronics — Wrong billing

Address:

Bajaj electronics Punjagutta

I have purchased Samsung QLED 50Q60A TV from Punjagutta stores they have finalised bill 67900/- on emi @3350 with down payment 18750
Exchange Samsung TV priced 5000/-
There is no due slip or Acknowledgment for the TV picked up by the Bajaj delivery agent.
No mention about this in bill .
But when bill receipt given it was reflecting 55 inch with 75000/-
On asking for clarification the manager muthyam agreed to change bill
He changed the model number but price is 75000/-
When questioned regarding this he says he will write to head office.
Mr Amit sales person also is involved in this matter
Both are mischievous
I request the head office to take stringent action against such personal and correct my bill.