Worst service ever experienced up to date at samsung tygervally

Absolutely utter bad service. Send my phone for a repair on the 14/03/2018. Phoned them on the 15/03/2018 to ask for the quotation that was not received. On the 26 and 27/03/2018 i had to phone again for the quote that i still have not received. Finally when i received the qoute i did the payment and sent the p.o.p via email 28/03/2018. Today is the 11/04/2018. Still waiting for a call for when the phones going to be done. Paying R5000.00 for a repair and getting this S### service are driving me insane. What legal steps can i take to make sure that this bump in the company get sorted? Worst service that i have ever experienced. Not one cent worth.