Guarantees that I can give or not give when setting an advertisement

I give guarantees:

1) Quality
Every work is done as responsibly and quality as possible. I call the customer with a display of the screen to give up the job and show its quality. I take into account any wishes and corrections.
2) The result
I’m always working on the result and ready to discuss orally or record in the contract the necessary final result of my work.
3) Statistics
I can give a guarantee to the general SR. indicators of statistics.

I don’t give any guarantees:

1) Recovery
I don’t give any guarantee that the service provided to me will take up 100% or bring you great profits.
2) Costs and number of conversions
I do not guarantee that the cost and the number of conversions will be clearly fixed.
All promises and exaggerated expectations
I don’t give promises and immediately discuss the real situation on the market without forming exaggerated expectations from you.