Held hostage doubly!

I had an overpriced call out fee, R495 for a quotation. Which we had to pay in cash or transfer to the company before the visit. The quotation to replace a SMEG oven, bottom element was R4000 half deposit and half before fitting. I needed to vacate my apartment and move the contents from CPT to PLZ. I was told 14 work day wait for supply of part from SMEG. On inquiring I was poorly treated by Customer service officer, speaking over me from a dizzy height and told on 18/12/25, they are having annual closing on 19/12/25 and had no supply from SMEG. If they get the part they will only fit after full payment has been received on 19/12/25. If they don't get it, fitment is uncertain. On asking about return of my deposit the conversation was killed and the call terminated very abruptly, by Sharlene (the only Sharlene there, no surname given after mine was given in trust. I am being held hostage doubly, I can't move my contents to PLZ and I can't get my deposit back. My consumer rights are being violated. I stand vulnerable before this service provider with no recourse.