This weekend Verizon Wireless fessed up to billing 15 million of its customers for data services they didn’t use. The admission came amid an FCC investigation of the deceptive charges.

Verizon Wireless says it will issue refunds or credits of $30-$50 million to customers hit with the unauthorized charges, about which the agency has received hundreds of complaints about over the past three years, according to the New York Times.

The mystery charges were assessed on customers who did not have data access plans, but were nonetheless hit with one or more charges of $1.99 when software built into their phones initiated data exchanges or they unknowingly went online on their phone.

We are glad Verizon has finally admitted to slipping these sneaky charges into the bills of millions of consumers for services they did not ask for, authorize, or inadvertently accessed, but we are far from satisfied with the solution offered by Verizon.

It’s unclear if the credits or refunds will even equal the amount of wrongful charges paid to Verizon by consumers. Further, why did it take Verizon at least three years to knock it off?

Another important question is whether the FCC will hit Verizon with sufficient penalties to convince Verizon and possibly other wireless companies to refrain from such shenanigans in the future?

Despite Verizon’s action to finally refund its customers, the FCC must continue its investigation. We urge the FCC to act quickly and decisively to make it clear to the entire telecommunications industry that anti-consumer and anti-competitive practices will be both investigated and dealt with, including tough and meaningful penalties.

This situation continues to remind us that wireless bills are highly inscrutable, with poorly explained charges all over the place. Luckily, the FCC is in the midst of beginning to consider industry wide rules to deal with “bill shock.” This is an opportune time for the FCC to act quickly and decisively to adopt strict consumer protections to deal with these (and other) kinds of anti-consumer and anti-competitive behavior.

In addition to industry-wide rules to prevent “bill shock”, consumers should also examine their bills closely and question any unexplained charges. Should they not receive a satisfactory solution, consumers need to complain to the FCC and other authorities.