Failure to resolve my banking query

On the 27th of November 2015 I utilised the money send option namely imali cash send, it's basically sending money via cellphone the last numeral I entered was wrong and as soon as I realized the error I called to ask them to reverse my transaction, I called the number I had accidentally sent the money to and it was on voicemail which was indicative that it was not withdrawn, to my dismay I was told that I was I would have to wait for 7-10days....isn't that sufficient time for the wrong receipient to be able to withdraw the money not intended for them? A bank institution is intended to protect your money and be able to act swiftly in such situations for a bank that's trying to re-brand itself in terms of A+Customer service its failinh as other banks give you an option of reversal of transactions. Im very upset!