Bad service Mtn and Samsung

On 19 March21 1 MONTH AGO I took my Samsung A50 for repairs to Mtn Westgate. Told me it could take 1 to 3 weeks. We are now in week 5 and no joy. Phoned them many times and mostly they do not answer their phone. Spoken to Ginel not sure of the name on 13 April who said he will investigate. Phoned me 15 April he is still investigating. I also spoken 8 April with Bongiwa at Samsung who told me the phone are fixed and will be at Mtn Westgate 12 April. Needles to say phone not there yet. Also spoken to Lorraine at Samsung on 15 April who will investigate and phone me back. It seems nobody know were my phone are. Coming to the date I must pay my contract I must pay and I will not pay.