What do I need to do to get a good deal ?

[NmOverson]

Good evening 

ok so my deal has just finished. I've been paying about £85 for 18 months.

my deal has finished and now it's £120.

today I just called and was told the best they can do is £106 if I lock in for 24 months as there are no good deals going.

his advice was to call back in 10-15 days to see if there is a better offers on.

to get a good deal is the only way to threaten to leave or leave and return?

I don't mind locking in for 24 month but not at £106 a month.