Standard bank not looking after current customers

don't understand why Standard bank is not looking after their current customers , we got a quote from Nedbank that they are willing to give us a rate of (Prime - 0.6) if we move our two property's over to Nedbank that's great! we then send the quote to Standard bank asking if they can please try to match Nedbank's quote because we have been with Standard bank for a very long time now and currently having 3 property's with them and my husband is a private banker with them and this is the reply I am getting from Standard bank "

"Good day Unfortunately, we do not re-price home loans post registration. All rate negotiations have to be done at grant stage. The main reason is that the cost of credit, which is the legally binding contract between the customer and SBSA, has been signed and agreed to by the customer. The cost of credit highlights the rate the customer has accepted by signing the document.

Kind regards Home Loans Pricing l Home Loans PBB 30 Baker Street I Rosebank I 7th Floor, East Wing "

if I can give advice rather choose another bank to finance your property's with if you have options to chose from , its looks to me like its only Standard bank that does not relook at your rate after a few years. bad after service typically having the client , don't to after service at all this is what I call after service I KNOW that a cost of credit is binding and I know I agreed upon the rate the day we signed 4/6 years ago , merely negotiating again for a better rate after a few years and then I get this type of emails stating that I agreed on the rate the day I signed , BAD SERVICE AND BAD COMMINICATION BACK TO THE CUSTOMER. don't tell me its not possible to sign and agree upon a new rate, impossible. looks like Standard bank has more then enough business they don't care if they loose customers to another bank.