behind my back

Hello, hello.
What's this talk about honesty?
When all you pay me is lip service,
And all that goes behind my back?
Behind that tight smile of yours?
Lies, lies, lies, lies.
Half-truths. Half-lies.
Vague ramblings that sound good
but mean little to me.

Hey?

Maybe it's not time yet.

I'll be holding out on the payment.
Can't con me with a fake invoice.
Can't con me with merchandise you don't have.

Give me a trial run.
(A money-back guarantee.)

Can't promise me those, can you?