Bad service

My son had a Tablet that was on contract, the contract expired in June, he canceled that in May, after that they keep on billing him for loading data onto the sim card that they block, we went to Vodacom where we had to pay another R427.00 because they did not do the migration, the sales person said they will refund us the money, I only need to phone the accounts department, this is going on now since we canceled the contract, I keep on phoning them and every time it's somebody else on the line, that tell me we had to wait 7-14 working days for the refund, I send the proof of payment in September and again in October, this is really ridiculous as this is now 6 month later. I am very disappointed in the bad service that we received and will not recommend Vodacom to anybody.