Bank of Montreal (BMO) has tendered an apology to its MasterCard customers who are witnessing a service disruption and are unable to access accounts as well as their credit cards.

BMO has promised to resolve the glitch as soon as possible.

Scores of other BMO customers who’ve seen their credit cards rendered useless or online banking information become inaccessible have been badgering the bank as well as MasterCard over the matter.

Many of those who have been turned away by BMO’s seemingly overwhelmed customer service phone lines are turning to Twitter.

BMO spokesperson Ralph Marranca was quoted by globalnews.ca as saying that, "the disruptions were related to "systems work, which resulted in some errors processing payments to MasterCard accounts."

"Unfortunately, this has led to higher than normal call volumes," Marranca said in an email message.

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"Those attempting to view credit card info on online/mobile banking may experience [temporary] interruptions," the bank’s feed said.