Denting mattress

I contacted Decofurn on the 25th of August with regards to my Mattress that was denting, and having to be turned at least weekly. This bed was bought begining of July. They then asked me to send pictures of the mattress, and gave me an email address. The pictures were sent that evening. There were mails back and forth from there. Mainly me asking if there is any feedback, and then being promised that feedback will come. On 30 September, I got a phonecall, a lady then said she'd try her best to have the mattress returned within that week. On the 9th of October, I contacted them via email again. I could not find the number, and just needed to get the contact details from them. They arranged for the lady to phone me with the details again. She phoned me, and gave me the contact details on 14 October, a cell number and a landline. Again, they'll try to have the Mattress delivered within the week. So at this stafe, I was not at all annoyed yet. Duds happen. And I got one. On 5 November, I tried following up again, only to find out, I had been given the incorrect cell number, and the landline never gets answered. It is now 2.5 months after the problem has been reported, which is longer than I had the mattress before the problem was reported. I do not weigh more than the prescribed 120Kg per side, and I live alone, which makes it rather difficult to turn a mattress without breaking any and all lamps in sight. I'm hoping that this will escalate the matter to a point where I can get my new mattress. Hopefully before doomsday.