Account downgrade Issue

I've requested my FNB Premier Cheque account to be downgraded to an Easy Savings Account on 7 April. They told me it's not necessary to go into the bracnh to do and. They said they tried to contact me but I did not see any calls from FNB. Eventually a lady told me that is takes 7-10 working days. Today is the 12th working day and still the account is not downgraded. I cannot see any reason why this is taking so long and absolutely no one is getting back to me. I'm thinking of moving my home loan account to another bank if this is how long a minor downgrade takes.