BAD Service from FNB

It is almost 3 months now without been assisted from FNB i cannot upgrade my account, when i go to bank they always tell me that they have sent emails and they will contact me within 3 working days but still no call for the whole 3 months when i go to bank same story more than 6 time now . I dont enjoy being a client of FNB now the service is very very poor. How can one make turnover R3 millions Rand year and still be on easy account .i have more than 5 accounts with FNB but i regret each and everyday now for being your client.