Poor service by Auto Glen Bmw

I took my car for service end of August. After I collected my car I started receiving mechanical fault where the car would cut me everytime I accelerate above 60km/h. As time went by it started shaking whilst driving.

I booked it for inspection on the 6th of September 2018. I checked it in for fixing on the 7th and I was told I can only get it the following day which was the 8th. No transport was provided for me to get home that day n go to work the following day. I was told I have to make a plan to get my self home safely when I asked for assistance.

The problem was not fixed... on the 18 of September the same thing (cutting of the car and shaking) started again in a very severe way this time. I took the car back to the dealer today on the 19 th of September. They just called me few minutes ago to tell me I will not receive my car today, they will advice me tomorrow on when I will get my car. This is really inconveniencing me since I hv to fetch my daughter at nursery school by foot. They still did not provide me with any courtesy car to assist me while they fix the error I belive they caused.

I say this because before I took my car for service I had never experience such mechanical fault. Im frustrated by their service.

Please assist what must I do???