The simple solution is to terminate all existing brick and mortar employees.
Install touchscreen kiosks, that are nothing but a wiki of the products that the store offers for sale. Let users browse that wiki. If they have specific questions, let them touch something that connects to a call center in, say, Walvis Bay. (A call center there costs roughly half the price of a call center in India.)
Hire one person, whose function is to ensure that the self-checkout registers are working correctly. Make that five employees, so the store can be open 7/24. Add five more employees, whose sole function is to clean the store every shift. (One person per shift to control the cleaning bots.)
If the local Walmart did that, their customer service would go up several orders of magnitude. That store would also be several orders of magnitude cleaner.
If Pennys did that, customer service would go up by several thousand orders of magnitude.
If Radio Shack did that, customer service would go up several million orders of magnitude.