Please forward us your error message so that we can investigate this. Note, if you have linked two accounts on your profile and the selected account is the primary one with no funds you will get the error.
If this is still an issue on your side please mail us here: [email protected] for further assistance.
Plesae be advised that should you wish to link a new mobile number to your account. You will need to visit your nearest branch or contact customer care on 0860 123 000 in order to be assisted further.