I have not been getting warning messages telling me my credit balance has fallen below two pounds, does anyone know why ?

Last summer my balance dropped to zero while i was on holiday and i didn't get a warning then either, when we returned home we had to throw everything out of our fridgefreezer because it had went badly off, I'll leave that up to your imagination, all because I never was alerted that my credit was running low, how come ?

Thanks in advance for any replies.
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