Disappointing service

Sent a request for discovery to conclude pro pata refund and adjust my premium... 3 weeks later still nothing... If they operate like this on servicing queries, what will happen when I am claiming?

Background: On the 22nd Jan we agreed on a R2 169.82 premium (with new schedule sent to me), but Discovery deducted R2 666.33 instead. On the 12th March I sold my car, received a call on Discovery an informed them that I had sold it. On the 18th March, spoke to Clarence from discovery informed him that I had sold my car. Requesting the R497.00 difference, as well as a refund for the march from the 12th and sent proof of sale via email. I waited 3 weeks, did not receive a refund. I reversed the Feb payment and requested that my policy be cancelled. I received a call from Duduzile on 9th April, she advised that only the household premium would be deducted from the 25th April. On the 9th Discovery deducted again Spoke to Wendy on 10th, she advised that herself or Duduzile would call. But still didn't receive a call. Now again today Discover deducted again from my account

Useless!!!