My baby also having the same prob like you. I gave him bottle just one week before I return to work. because of unsuccessful for the first week, I extended my leave. I tried to change from Avent teat to Nuk teat, silicon to rubber but still the same. My hubby and mother in law also tried to distract him, I hide myself during feeding time, gave him expressed breast milk...still no improvement.
Lucky we went to NTUC and saw the first years brand bottle, the teat design like mum's breast. At first my hubby hesitate to buy, lucky I make the right decision to try. It really work.
I just extended for two weeks.