Foneyam poor service

I've purchased Samsung A15 on 30th November 2024 at Pep store. Mompat Mall in Vryburg. On the 4th of December 2024 I returned it after four days of use because the charging port was defective so I couldn't charge the phone. Immediately after the lady at Pep store book the phone so that it can be exchanged with the new one. I took back the phone within stipulated time frame in order to receive new a phone however I couldn't because Foneyam said the price difference between the defective phone and a new phone they were requested to adjust contract so that phone could be exchanged easier, the call center lady said she will escalate the matter to support for matter to be resolved nothing happ. Foneyam was contacted many times with no help coming from them. They gave atrocious service sending me pillar to post. The was escalated to Pep store regiional manager to resolve the impasse but nothing resolved. Foneyam sent sms on 23rd December saying I should expect feedback back within 3-5 working days and they failed to do so. Lately,The manager at Pep store called them then they said the phone needs to be fixed not replaced with a new one because seven days passed and remember i took back the phone on the fith day within well the time period prescribed. I told them I am not going to take a repaired phone because i am expecting new phone. Subsequently I told them I am cancelling the contract and they must give my deposit back, the lady at Foneyam said when i am cancelling the contract I will automatically forfeite my deposit also I must pay cancellation fee. It is unfair because i took back the phone on time.