Dissatisfied service and dishonesty

I took the phone in 25 Nov 2023 she said its 1500 for repairs I even ask if they can keep my photos on the phone she advise another 200 rand I said fine and I told her I'm getting paid the 20 Dec 2023 she gave me the quote and I left then they phone me in the week I must give a deposit and I said why didnt they say that saturday when I was there then they send me a message stating my phone is ready for collection so I went Sunday to collect then it wasn't ready she advise I must pay deposit which I did and now today the phoned me to say the monthly special is finish the phone is going to cost me know 3500 rand

My thing is I was at the shop twice they did not say anything

I refuse to pay the amount of R3600 as when the quote was done I was quoted the special amount