Rstudio - Update and add new data

Question

Hello,

I’m looking for IBGE data (library("sidrar")),

df <- get_sidra (api = "/t/1846/n1/all/v/all/p/all/c11255/90707/d/v585%200")
#Selecionando as colunas que me interessa
df1 <- df[,c(7,10,13)]

This returns me the historical series of GDP

df1 <- Trimestre (Código)           Setores e subsetores           Valor
        199601                      PIB a preço de mercado         189323
        ...                             ...                         ...
        201903                      PIB a preço de mercado         1842700
        201904                      PIB a preço de mercado         1842740

And saved this file on my computer

read.xlsx("df1.xlsx", sheetName = "PIB", header = TRUE)

When a new data comes out, 202001, IBGE revises 3 previous data (201902, 201903, 201904) and publishes 202001,

then I just run the code to fetch the last 4 data, to avoid having to fetch the complete series

df2 <- get_sidra (api = "/t/1846/n1/all/v/all/p/last%203/c11255/90707/d/v585%200")

After having my df2, I want to update the data for 201902, 201903 and 201904, and add the data for 202001

To add only the new data, I was using :

wb <- loadWorkbook("df1.xlsx")
addDataFrame(df2,getSheets(wb)$df2,  col.names = FALSE, row.names = FALSE, startRow = nrow(read.xlsx("df1.xlsx", sheetName = "PIB"))+2)
saveWorkbook(wb,"df1.xlsx")

But this function doesn’t help me update my previous information. Could someone tell me how I can do this?