Very Disappointed

Good day I bought 2 deep cell batteries from Ashcom Online on the 1st July 2022 with a 1-year warranty and the batteries were delivered at my home in Swellendam. These batteries only last for 4 months then I let them know and they replace the 2 batteries on the 2nd of November 2022. They send me a mail back with the following message (One year warrant. CSB batteries can easily last up to 10 years). These two batteries only last 5 months and again I mailed them back at *** three time since March 2023 but, they didn’t even come back to me. I then log a complain on their WhatsApp number on Wednesday the 3rd of May on the Ashcom online website and they just app**** the following (Noted Elzana, let me respond to you by end of the day. Sorry we missed your emails) They didn’t respond back at all, and I send a new WhatsApp today the 5th of May and this time they didn’t even respond at all, in my first WhatsApp message they came back immediately. Why do they just ignore me now as I am still within the 1-year warranty for these 2 batteries?