The only file nobody else can delete
Every other note in this series ends up depending on something the reader either has or does not have. The slip. The date. The branch. The written response. It is worth treating that as a single habit rather than as four separate pieces of advice, because the cost is a few minutes a week and the benefit only becomes visible at the moment it is too late to acquire. There is also a second use for the same file that has nothing to do with disputes: in an environment that runs on cash, a contemporaneous record is the only thing that can tell you what a month actually cost. Both purposes are served by the same five minutes.
A routine that takes five minutes a week
The format is irrelevant — a notes app, a paper diary, a folder of photographs. What matters is that entries are made on the day rather than reconstructed, because reconstruction is where both accuracy and usefulness disappear.
One place for everything
Photographs of slips, dates, branch names, any written correspondence. Scattered evidence gets submitted in instalments, and instalments make a case look assembled after the fact rather than recorded as it happened.
A line per visit
Date, branch, roughly what was spent, anything unusual. Fifteen seconds each, and it produces the two things nobody can generate later: an accurate monthly figure and a timeline that survives.
Speed beats completeness
A rough note made the same day is worth more than a careful reconstruction weeks later, because business records have retention periods and a late request can be asking for something that no longer exists.
It is yours regardless
The business holds its records under its own policies and timescales. Yours are not subject to those, which is the entire reason this habit is worth the trouble.
Asked at the counter, and online
Is there any point keeping records if I never complain?
Yes, and arguably a larger one. In a cash environment there is no statement, which means the total spent over a month exists only if somebody wrote it down, and estimates from memory are consistently lower than the real figure. Whether or not a dispute ever arises, the record is the only route to an honest number. The dispute use is a by-product of a habit that is worth having on its own terms.
How long should I keep them?
Longer than you think you need to, because storage costs nothing and the alternative cannot be recovered. Rules on complaint windows vary by operator and the independent adjudication route has its own conditions, so there is no single period we could state honestly. What we can say is that the failure mode always runs one way: people discard material and then wish they had it, and nobody has ever been harmed by a folder of photographs sitting unused on a phone.
What if I have already thrown everything away?
Then act quickly rather than concluding it is hopeless, because some material sits with the business rather than with you. Requesting it needs a specific date, time and branch to be actionable, so write down everything you can remember now, while it is as accurate as it is going to get, and raise the matter through the operator's complaints process without waiting to assemble a perfect account. Retention periods run whether or not anyone is ready.
