Hello Buckman.
A lot has happened this year, and businesses are struggling to survive, and sadly that means in reality fewer customers and that generally mean's less income. To offset the losses most business will be increasing prices or finding ways to maximise income along with other cost reduction processes which might well include job losses.
We may see some businesses offering what seems to be better deals as we exit C19 restrictions, principally to stimulate business, but soon those prices will rise, and most likely to a level somewhere above the pre C19 levels.
Count yourself lucky that service consumable have apparently been included in your previous contracts. It does not mean things can't change, and teh Covid situation is a significant factor. It may well be significant that service personnel have been lost, perhaps the business owner's reviewed their servicing budgets and realise that offering inclusive consumables was a cost too far.
It is a customers responsibility to ensure the product or service being offered does in fact meet with your needs and or expectations. You need to verify the T&C's before agreeing to a contract.
The fact the notices in the business do not state whether consumables are included or not would automatically lead me to assume they are not included.
Covid is not an excuse for shoddy workmanship, that is separate matter and you should take that up with your supplier using their complaints procedures.