The majority of companies wanting your business will introduce an introductory deal.
That then migrates to a standard customer offer after your initial offer ends.
Have you spoken to VM in recent months about looking at reviewing your package?
It's worth getting in touch as quite often older legacy packages need reviewed but if customers don't call in to change them, it's assumed they are happy with the service.
There's millions of customers and a few thousand staff working at VM so logistically they can't call customers to review with them when contracts change or offers end and the onus is on the customer to get in touch.