Shocking Sales department service when trying to upgrade

Contacted the sales department to look at upgrading my Fibre line to a 500MB line. I was told that pricing on Mweb website is ONLY for new customers and existing customers pay a higher cost for the lines. I asked if the only way to get a good deal was to look for a new provider and the consultant told me to contact the retentions department to cancel my line. This is shocking service