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If you are invoicing through a limited company the only way to get paid is by filling out an invoice on one of the Specsavers paper invoice templates (they may accept personal invoices) and asking the store Director or Manager or whoever deals with the invoices in the store to make sure they include and send your invoice along with all the other supplier invoices to get paid. So you will probably have to check with the store if they have done this as July is a long time.