Impact Meter refuses to give me a Refund of credit i have on the account while i am no longer in service with Impact Meter.

At Parkstreet Mansion Hatfield Pretoria has moved from Impact meter as the service provider of the electricity as from the 1st February 2019 and since then i have submitted my claim to impact meter for the deposit and the credit i have with them on the 24th January 2019 to date Impact meter has not refunded me all they do is to give me a running to till this morning. They keep on saying i can only receive the money after the last invoice has been paid as from the date the disconnection of the electricity from impact to myvoltage. i have been with my voltage since 1st February 2019 and yet they are still insisting i have t wait for a month. Impact meters is full of poor services and they are rude.