Extremely unhappy with service

I am so disgruntled by the service I have been getting from Leroy and Merlin, from mid Jan I have been putting up a fuss to just try and get anyone to help but absolutely no one has made the slightest effort to assist me or assists me halfway. I had to firstly run after the quotations department for a quote, I had to call to follow up and only after I called, I got it. I made a payment and sent a POP with all required details as requested and no one acknowledged my payment. I had to call to follow up if my payment has been received and asked for an acknowledgement of payment and my balance as I had followed their instructions on the layby process. No one could find my payment then I sent the POP for the second time and they still could not send me acknowledgement. I was then put in contact with a store manager who requested a POP for the third time, I was so annoyed after so much back and forth he then said he found the payment, I asked for an acknowledgement, he went quiet. The next week I sent a follow up he got someone to call me from the contact centre, I DO NOT UNDERSTAND WHY, like all I want is something that shows my payment and the balance, I wanted to speak to a manager and I asked the manager to escalate the matter and have someone more senior call me back, NO ONE HAS CALLED ME AND I STILL HAVE NO ACKNOWLEDGEMENT OF PAYEMENT. I feel so defeated by the service I have been getting. I wonder if it’s even worth it.