Unable /unwilling to honor quote

Yesterday my husband did an upgrade online. We received a quote of R378 p/m. This morning I received an sms asking me to confirm the upgrade, but at R479 p/m. Where did the extra R101 come from???? Called to enquire and received reply of "This is the price now, just cancel if you don't want it." this is disgusting service. All we ever get is terrible service even though we have been loyal customers for over 20 years.