Edgars Customer Service is pathetic!!!

I purchased 3 tablets online and due to a fault on the tablets I returned it on the 10 February 2018 to Blue Route Mall , Tokai as instructed on the leaflet I received with goods. The cellphone department then refused to take it and called the Manager. I reread the terms and conditions on their packaging to the manager and she still refused to do a refund , I left the goods at the store and was promised it would be cleared up in the next 48 hours. It took for than 48 hours for me to receive any feed back and I still had to call to enquire as to the result of this query. Its 12 April 2018 and Edgars demands payment threatening me with a bad credit score if I do not pay. The credit has still not been done on my account. I have used so much airtime calling their Head Office - Account queries department with no luck. The Manager at Blue Route promised to call me regarding this matter 3 weeks ago , I have been calling her the passed week with no success , left messages but she never calls back. Shes either just left , starts later, or is on lunch. My word how long does it take to do a credit refund when the customer doesn't even have the goods it has been returned to Head Office and been assured the matter is resolved but I keep being getting billed. This cannot be legal being charged for goods you don't own.