Ratepayers who wished to apply for a rebate were advised that they could do so online or call the council to schedule an appointment.
"I don't use a computer and because the council office was closed, I didn't think I would be able to contact them for an appointment," Beamsley said.
"I wonder how many other pensioners fall into this category?"
The council had since reimbursed Beamsley for the difference of the instalment amount and the amount for future direct payments had been adjusted.
"I'm glad it's been fixed now but when you have to budget on a limited amount each month it doesn't make things easy."
In the statement, the council said ratepayers were able to apply for a rates rebate for the 2021/22 rating year at any time within the 12 months.
"Ratepayers still have the opportunity to apply for a rebate.
"Applications for rates rebates are open until June 30 next year. Lockdown may have affected ratepayers who would normally apply in August, and we did field phone calls regarding this.
"Most were happy to wait until the office re-opened, some wanted the application form posted and others downloaded the application form from our site."
Whanganui Age Concern manager Michelle Malcolm said it was important to remember that a sector of the Whanganui population does not use digital media.
"We didn't get any calls about rates payments but it is important to keep up print communication for those who still use it," she said.
"When someone is on a limited budget that difference in a payment amount could mean doing without essential items like groceries."