by OR with

English as a Second Language English Vocabulary, Grammar and Idioms
1

Hello

Which one of the options in bold is O.K?

We would preserve customers’ right (with or by) supply of high quality products.

Thanks a lot

2

As the sentence is taken out of context it is not possible to be sure.

Possible:
We would preserve customers’ rights with the supply of high quality products.
We would preserve customers’ rights by supplying high quality products.