Peugeot service worst ever experienced

My wife has been driving Peugeot vehicles for nearly 30 years -I drove one for 5 years. That’s 35 years of loyal service. My wife’s Peugeot broke down a week ago and was towed in to Williams Hunt Fourways who quoted me R20000 and repair to be completed in 4days . I paid the R20000 only to be told that they had the incorrect part and the part would be available in 8 weeks. Two days later the 8 weeks has become 4 months. I requested either a loan vehicle or a rental at a reduced price. They refused point blank. The net result is we cannot have the car repaired for at least 4 months ( it is merely the replacement of a petrol pump ) and are expected to rent a vehicle for 4 months. This is the worst service I’ve ever experienced.