Game Store needs to revise their accounts administration and record keeping

I've purchased a treadmill on credit in November 2018 and now in November 2019 I would like to make use of the guarantee. I have misplaced the receipt. Since the product was bought on credit it shouldn't be such a tedious process to retrieve the receipt from the system. However, I get an *********** response that the system is only able to retrieve information from threee months back.

I am very disappointed with Game store and the way their admin is conducted. It's been almost a month that I'm sitting with this issue and there is no positive response!