The company claims that only three of its customers had been contacted by the third parties who stole customer information, and that none of them has suffered financial loss.
This is in light of the 100,000 customer details which the company has admitted were compromised.
"To date three customers have been in contact as they have received unsolicited and possibly repeat telemarketing calls, potentially as a result of this," said the firm in a statement.
"It is important to point out that none has involved any financial loss and we have no evidence that any customers have had their credit card details used illegally.
"We take allegations of this nature extremely seriously and are already taking appropriate legal action against the third parties we believe may be responsible for this unauthorised use of our customer data."
But some customers are angry about what they see as Bulldog leaving them in the dark over the break in.
There was no mention of it on the website until today and no alerts have been sent out with bills either asking customers if they have been affected or warning them to check their finances for evidence of malfeasance.
"The first I heard of this was when it appeared in the press," said one customer. "You'd think they would at least let you know that something was up. I'll be watching my bank statements like a hawk until this is sorted out."
To date there has been no statement as to how the details were taken, but a computer break in, or an insider stealing the information, are the two most likely explanations.
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