Bad Service Throughout For the Funeral

i am a client of ZFD and this year my mother passed on, on 20 september 2017 midnight. and so believing that ZFD is a 24/7 company (as they claim) i tried calling the undertaker to come assist with the body of the deceased but i couldnt reach anyone even at the head office and then i had to sleep with my mother's dead bdy till the morning at 7 am the next day and they tell me that i should have called an ambulance ( if they had communicated such information on how to do with asking the undertaker to come pick the body i would have, but i didnt know about it at all) and then when they had to give me my mothers death certificate as i needed it to claim my mothers funeral cover but they came up with excuses until i threatened them and then the called me to come fetch it and only to find out that the death certificate has errors such as that my mother was married but the death certificate says she was never married and again the death date of my mother was written as 22 september 2017 and not 20 september 2017 as it should. going on again they told me they will be bringing my mothers body on the 29 september at 4:30 pm but they then came 1 hour before that and my mother had to be heated by the sun outside for that time till we were able to get all other resources for the family and then again on the day of the funeral they gave us time that their cars will come to the venue and depart to the cemetery at 11:00am but they did not show up and we tried calling there was no answer until we called again and they said they are still busy nd they came at my house at 1pm to depart for the funeral. so their service was bad and they did not show any remorse for that. please help me sue them if possible.