"We apologies" or not, there is one thing I do not understand.
Why are yearly licenses to be refunded? As I see it, solus authorized licensecart to sell yearly licenses, they did, the agreement is now between solus and the end user, the middle man has nothing to do with it, they do not provide after market services. What if the store you bought your 1 year antivirus license gets under and your license is invalid and has to be refunded in part? Something is wrong some place, or their agreement with solus is crazy.
Could be that they didn't actually paid for annual licenses and just used the upfront free for annual to boost their short-term cashflow.