PEP cellphone query/ Shocking Customer Service

A horrible service ever received from Pep Bluff. I bought a phone on the 24th Dec 2020, told the supervisor I needed a phone that takes Vodacom simcard. Was given an MTN phone & was told it uses two different networks(as the model I wanted was out of stock). Slot 1 takes MTN only & slot 2 can be any network. Phone worked for few days with Vodacom simcard and stopped. On the 2nd Jan 2021, I took it back to the shop and was told nothing wrong with the phone, I must check with vodacom it could be network issue. Vodacom confirmed nothing wrong with sim, but looks like phone is network locked(MTN locked). 3rd Jan I went back to Pep that's when they said they will sent it back to MTN to be checked as that has never happened before. 29th Jan I went back to the store as I realized that they didn't give me back the purchase receipt , the store supervisor said not to worry it was sent to MTN with the phone. I told him he cant say not to worry I need it as proof that I bought that phone, they should have kept a copy, they said they dont have ,actually gave me MTN number to call and request for a receipt, which I refused & said that's their responsibility. I then called their head-office(29th Jan) to open a query and was told the area Manager will contact me. She called me on the 2nd Feb to say I must go back to the shop to get my receipt, she also confirmed the phone is still with the store (since the 3rd Jan) it hasn't been send to MTN, she said if by 30 days(excluding weekends) the phone is still not gone, I will have to get a refund or a new phone.. This made me upset it its almost a month and the phone is still with PEP. Went back to the shop and the store manager told me a different story, " the phone was sent to MTN on the 3rd Jan". Now I have two different stories, I called MTN repairs, they checked on their system, that phone is not with them, said I must get proof of how it was sent to them from PEP. Went to PEP same day, the store manager denies saying the phone was sent on the 3rd, I asked where is the phone, she said she cant tell me, she did what she was told to do, followed procedures. She said I will get a refund after 5 days, told her the area manager said 30days, she said that's not true, its 35 days. I called area manager again, so now says she confirmed with MTN refund is after 40 days, yet MTN said they don't have that kind of policy. Today (2nd Feb) is the 29th day since I left the phone at PEP, yet it hasn't been send for repairs. They have my money I have no phone rather their bad attitude and poor customer service. The procedure is to lie to customers? They have policies which they are not sure of themselves, one says 30 days, the other says 35 and later its 40 days. I called the Area Manager who told me never to call her again and dropped the phone on me. I am a very disappointed customer who got poor service from pep( Pep Store Manager, and Pep Area Manager). I have no phone, yet pep has my money & the phone.

Somebody please advise how I can get urgent help?