Different statement dates can explain why an account question changes. Preserve each source so a service discussion can compare the actual entries rather than an undated remembered total.
Retain the complete statements
Keep each document’s tax period, source, and date visible. Avoid replacing an older version with a newer total if the history is relevant to the concern. Compare categories and transactions as described instead of silently combining them into a separate calculation. Mark the entry you cannot explain and locate any payment confirmation that may relate to it. A clear comparison identifies the question for review without deciding which source is correct beforehand.
Discuss changes with context
Ask what event or requirement could explain the difference and which additional record would support examination. Payment difficulty can be raised alongside that account question with its own financial facts. Clarify the service scope, fees, and responsibility for any follow-up communication. Keep later findings or responses beside the relevant statements so the explanation can be traced to the actual material reviewed. You can call while some supporting history is still unavailable.